My personal sysadmin/devops notes and code snippets.

Other usefull files

• Reading List
• Performance Tests

Table of content

1. Openstack
2. CentOS
3. Linux
4. Spark
5. bash
6. vim
7. Python
8. Ansible
9. Git
10. Tmux
11. Chef
12. Sublime Text 3
13. Minotaur
14. Etcd
15. Vagrant
16. Docker
17. Mesos
18. Utils
19. AWS
20. Temporary

Openstack

Nova cli referance

nova image-list
nova flavor-list
nova keypair-list
nova secgroup-list-rules
nova list
nova boot
nova volume-list = cinder list

Look to some logs for find what hypervisor is used in openstack

cat /var/log/syslog | grep -i kvm
lsusb
lspci
dmesg | grep kvm
cat /proc/cpuinfo /proc/meminfo

Get access to configaration drive on Open Stack

mkdir -p /mnt/config
mount /dev/disk/by-label/config-2 /mnt/config

nova boot

--config-drive=true     to enable confdrive
--key-name <key_name>       add key pair
--user-data <usr_data_file> add usrdata file which will be executed on instance build in cloud init final module
--flavor <flavor_if>        choose hardware options
--file <dst_file>=<src_file>    transmit file to instance
--meta <meta_option>        add some meta options
--image <image_name_or_id>  chose image which will be booted

Error 500 - check name of security group for spelling!

OpenStack components and operands:

* Keyston - Identity
* Glance - Images
* Nova - Computing
* Neutron - Networking
* Cinder - Volumes
* Swift - Objects(Files)
* Heat - Orchestration(Templates)
* Ceilometer - Telemetry(Monitoring)
* Trove - Databases
* Horizon - Dashboard

List of all ovs bridges

ovs-vsctl list-br

List of ports on ovs bridge <bridge_name>

ovs-vsctl list-ports <bridge_name>

OVS switch must be on public interface not internal, but if it is set on public interface ssh session will drop, so we need some workaround.
We will need another playbook to check up on all networking settings like hostnames, interrelations, etc.
Every node needs up to 3 interfaces, public, internal, and one for ceph traphic. Public is needed on network and probably storage nodes.
OVS br-ex port must be public - think about creating some solution to this problem!

Centos

Add epel repo to Centos 7

sudo yum install epel-release

Fixing SELinux problems for some application e.g. nginx

sudo yum install policycoreutils-python-2.2.5-11.el7.x86_64
seallow () {
  sudo cat /var/log/audit/audit.log | grep $1 | grep denied | audit2allow -M my${1}
  sudo semodule -i my${1}.pp
}
seallow rabbit

sudo cat /var/log/audit/audit.log | grep nginx | grep denied | audit2allow -M mynginx2
sudo semodule -i mynginx2.pp

Bash scripts and function for creating .pp module from .te file

checkmodule -M -m -o postfixlocal.mod postfixlocal.te
semodule_package -o postfixlocal.pp -m postfixlocal.mod
semodule -i postfixlocal.pp 

createpp () {
  checkmodule -M -m -o ${1}.mod ${1}.te
  semodule_package -o ${1}.pp -m ${1}.mod
  semodule -i ${1}.pp
}

SELinux for rabbitmq

module rabbit-sensu 1.0;

require {
        type initrc_var_run_t;
        type unreserved_port_t;
        type rabbitmq_beam_t;
        class tcp_socket name_bind;
        class file { read getattr };
}

#============= rabbitmq_beam_t ==============
allow rabbitmq_beam_t initrc_var_run_t:file { read getattr };

#!!!! This avc can be allowed using the boolean 'nis_enabled'
allow rabbitmq_beam_t unreserved_port_t:tcp_socket name_bind;

SELinux for nginx uchiwa+api proxy

module nginx-sensu 1.0;

require {
        type var_run_t;
        type ntop_port_t;
        type tram_port_t;
        type httpd_t;
        type unreserved_port_t;
        class process setrlimit;
        class tcp_socket { name_bind name_connect };
        class file { read write };
}

#============= httpd_t ==============

#!!!! This avc can be allowed using the boolean 'httpd_can_network_connect'
allow httpd_t ntop_port_t:tcp_socket name_connect;
allow httpd_t tram_port_t:tcp_socket name_connect;

#!!!! This avc can be allowed using the boolean 'httpd_setrlimit'
allow httpd_t self:process setrlimit;
allow httpd_t var_run_t:file { read write };

#!!!! This avc can be allowed using the boolean 'nis_enabled'
allow httpd_t unreserved_port_t:tcp_socket name_bind;

Linux

Connect ot serial port with 9600 baudrate

1. minicom

minicom -D /dev/ttyS0 -b 9600

2. screen

screen /dev/ttyS0 9600,cs8

3. python

screen /dev/ttyS0 9600

-r flag in sed to use extended regular expressions (+ for example)

sed -r

Append after match

cat File | sed -r '/[a-zA-Z]*/ a\1'

Prepend before match

cat File | sed -r '/[a-zA-Z]*/ i\1'

Get ip address via wich you can reach internet

ip route get 8.8.8.8 | awk 'NR==1 {print $NF}'

get ip addr of interface e.g. wlan0

ip addr | awk '/inet/ && /wlan0/{sub(/\/.*$/,"",$2); print $2}'

Add route to default gateway

route add default gw 10.0.2.1

edit dns file

vi /etc/hosts

Check free disk space

df -h

Check disk usage in curretn directory

du -sh

Checking cron jobs

crontab -l

Top 10 largest files:

du -a /var | sort -n -r | head -n 10

Lists all dirs in current dir with their disk space usage

sudo du -sh $( ls -d */ )

PostgreSQL command reference(psql):

\list           lists all databases
\dt         lists all tables in the current database
\c db_name      connects to database db_name
\?          slash commands helper

list of all active processes

ps aux

add key_name to ssh keys

ssh-add <key_name>
ssh -i <key_name> user@server # ssh-ing using key_name

Path to vagrant ssh keys

cd ~/.vagrant.d/insecure_private_key

How to check open (tcp|udp) ports:

sudo nmap -sT -O localhost (tcp only)
netstat -tulpn (all ports)
netstat -tln (for tcp only)

Networking files

• dns config /etc/resolv.conf
• config of particular interface /etc/network/interfaces.d/*.cfg
• default interfaces config /etc/network/interfaces
• dns list /etc/hosts

Clear swap

sudo swapoff -a
sudo swapon -a

Will show time of all reboots

last reboot

Will show time of all reboots and user sessions

last

Date and time of last boot

who -b

Create a custom interface for in userspace interaction(program to program, etc.). It can be lik tap and tun(no ethernet headers overhead)

sudo ip tuntap add dev mytun mode tun user openwsn
sudo ip link set mytun up
sudo ip addr add 10.0.0.1/24 dev mytun

List of available nics

lspci | egrep -i --color 'network|ethernet'

Detailed info about available nics

sudo lshw -class network

Packet processing info of nics

cat /proc/net/dev

List all partitions:

vi /proc/partitions

Partition detatils:

fdisk -l <partition_name> # if <partition_name> is not specified, command will look in ti /proc/partitions

Mark partition as swap

fdisk -t <partitions_name>

Service name of dnsmasq dhcp server

sudo service udhcpd status

Ways to kill process from autostart (service_name may be find with ps aux | grep )

update-rc.d <service_name> stop
rm /etc/init.d/<service_name>
service <service_name> stop

To configure a kernel paramether:

sysctl -w <kernel_paramether>=<value>

To make change made above permanent edit /etc/sysctl.conf

The kernel ring buffer is a data structure that records messages related to the operation of the kernel.

To check kernel ring buffer(contains logs before syslogd and klogd started):

dmesg

To check all messages related to kernel

vi /var/log/messages
vi /var/log/syslog

Easy check of external ip using opendns and dig utility

dig +short myip.opendns.com @resolver1.opendns.com

tcpdump quick reference

to capature all traffic on the internal bridge interface.

tcpdump -n -i br-int

to capture all traffic on the internal bridge interface and dump it to a file named tcpdump.pcap.

tcpdump -n -i br-int  -w tcpdump.pcap

to read in a previously created tcpdump file

tcpdump -r tcpdump.pcap

to capture all traffic on any interface

tcpdump -n -i any

Network namespaces quick reference

List namespaces

ip netns

Show all interfaces inside the namespace

ip netns exec qrouter-1fabd5f0-f80b-468d-b733-1b80d0c3e80f ip a

Show all interfaces inside the namespace

ip netns exec qrouter-1fabd5f0-f80b-468d-b733-1b80d0c3e80f ip a

Check routing table inside the router namespace

ip netns exec qrouter-1fabd5f0-f80b-468d-b733-1b80d0c3e80f ip r

IP config inside the router namesapce

ip netns exec qrouter-1fabd5f0-f80b-468d-b733-1b80d0c3e80f ifconfig

IP config inside the dhcp namesace

ip netns exec qrouter-1fabd5f0-f80b-468d-b733-1b80d0c3e80f ifconfig

Ping the private IP (of the cirros guest)

ip netns exec qrouter-1fabd5f0-f80b-468d-b733-1b80d0c3e80f ping -c2 30.0.0.7
ip netns exec qrouter-1fabd5f0-f80b-468d-b733-1b80d0c3e80f ping -c2 192.168.122.14

ssh into openstack cirros guest

ip netns exec qdhcp-4a04382f-03bf-49a9-9d4a-35ab9ffc22ad ssh   cirros@30.0.0.7

to find inode number(key to metadata value) of file:

ls -i

Show memory mapping of process with sorted by amount of memory used

sudo pmap <pid> | sort -r -n -k2

Squid post script

sudo chown proxy:proxy /var/log/squid3
sudo chown proxy:proxy /var/spool/squid3

to create caching directories

sudo squid -z

grep not

grep -v '<pattern>'

grep and

grep -E '<pattern1>.*<pattern2>'

grep or

grep -E '<pattern1>|<pattern2>'
grep '<pattern1>\|<pattern2>'

cut characters to

cut -c <n1>-<n2>

cut lines and with space delimeter

cut -d' ' -s -f <n1>,<n2>

Best practice for killing squid processes

ps aux | grep squid | grep -v grep | cut -c 10-14 | xargs kill

To allow caching on Squid

cache_dir ufs /var/spool/squid3 100 16 256 #16 dirs with 256 subdirs each
cache_mem 500 MB
cache allow all

To enable forwarding on interface

echo 1 > /proc/sys/net/ipv4/conf/eth0/forwarding

Messing around with port forwarding for squid using iptables

1. Accept

iptables -t nat -A PREROUTING -p tcp --dport 8443 -j ACCEPT
iptables -t nat -A PREROUTING -p tcp --dport 8443 -j REDIRECT --to-port 500

2. Accept + redirect

iptables -A PREROUTING -t nat -p tcp --dport 8443 -j REDIRECT --to-port 500

3. proxy

gid=`id -g proxy`
iptables -t nat -A OUTPUT -p tcp --dport 80 -m owner --gid-owner $gid -j ACCEPT
iptables -t nat -A OUTPUT -p tcp --dport 80 -j DNAT --to-port 3128

Save iptables on ubuntu

iptables-save > /etc/iptables.rules

Buld options for squid with https for ubuntu

'--build=x86_64-linux-gnu' '--prefix=/usr' '--includedir=${prefix}/include' '--mandir=${prefix}/share/man' '--infodir=${prefix}/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--libexecdir=${prefix}/lib/squid3' '--srcdir=.' '--disable-maintainer-mode' '--disable-dependency-tracking' '--disable-silent-rules' '--datadir=/usr/share/squid3' '--sysconfdir=/etc/squid3' '--mandir=/usr/share/man' '--enable-inline' '--enable-async-io=8' '--enable-storeio=ufs,aufs,diskd,rock' '--enable-removal-policies=lru,heap' '--enable-delay-pools' '--enable-cache-digests' '--enable-underscores' '--enable-icap-client' '--enable-follow-x-forwarded-for' '--enable-auth-basic=DB,fake,getpwnam,LDAP,MSNT,MSNT-multi-domain,NCSA,NIS,PAM,POP3,RADIUS,SASL,SMB' '--enable-auth-digest=file,LDAP' '--enable-auth-negotiate=kerberos,wrapper' '--enable-auth-ntlm=fake,smb_lm' '--enable-external-acl-helpers=file_userip,kerberos_ldap_group,LDAP_group,session,SQL_session,unix_group,wbinfo_group' '--enable-url-rewrite-helpers=fake' '--enable-eui' '--enable-esi' '--enable-icmp' '--enable-zph-qos' '--enable-ecap' '--disable-translation' '--with-swapdir=/var/spool/squid3' '--with-logdir=/var/log/squid3' '--with-pidfile=/var/run/squid3.pid' '--with-filedescriptors=65536' '--with-large-files' '--with-default-user=proxy' '--enable-linux-netfilter' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fPIE -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall' 'LDFLAGS=-Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now' 'CPPFLAGS=-D_FORTIFY_SOURCE=2' 'CXXFLAGS=-g -O2 -fPIE -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security' '--enable-ssl'

Oneliner in bash for logging most memory consuming processes by

while true; do sudo pmap <pid> | sort -r -n -k2 | head -2 | grep -v total >> memory.log; sleep 5; done &

look for io statistics

iostat
vmdisk -d

Debugging of a process with using strace, redirecting output to <output_file> with max string of 80 chars(default is 32)

strace -p <pid> -o <output_file> -s 80

Edit crontab

contab -e

Dynamicly show file while it is upating

tail -f

Oneliner to log top 3 CPU consuming processes

(date +"%d-%m %H:%M:%S" && sudo ps aux | sort -r -n -k3 | head -3) >> /var/log/topproc.log

Checking disk space usage tools

du -sh *
ls -lah

extract the lines between 1234 and 5555" in

sed -n '1234,5555p' <someFile>

To create tar.gz archive

tar -cvzf mystuff.tar.gz foo.tex fig1.eps fig2.eps

gpg cheatsheet

export pubkey

gpg --armor --export okushchenko@cogniance.com

encrypt/decrypt file

gpg --encrypt <file>
gpg --decrypt <file>

list keys

gpg --list-key

Move+create dir oneliner

sudo mkdir -p ~/configs/vim/; mv ~/.vimrc $_

Quick time sync on two machines:

remote_time=`ssh user@machine1 date` && date -s $remote_time

Forced time update ntp

sudo service ntp stop && sudo /usr/sbin/ntpdate 0.ubuntu.pool.ntp.org && sudo service ntp start

Generate ssh-key

ssh-keygen -t rsa -C "your_email@example.com"

Add it to your ssh-agent

ssh-add ~/.ssh/id_rsa

Find command syntax

find / -name -type f <file_name> -perm 744 -size +100M

If screen is messed up clean to use

echo -e "\033[0m"
/usr/bin/clear

be careful with this one

reset

Recursive diff between directories

diff -bur folder1/ folder2/

System benchmarking utility

sudo apt-get install sysbench
sudo sysbench --test=cpu --cpu-max-prime=20000 run

Rsync files from one dir to another(archive mode)

rsync -a dir1/ dir2

Rsync in verbose + dry-run mode(no changes will be made)

rsync -anv dir1/ dir2

Install deb package

sudo dpkg -i DEB_PACKAGE

Downloading with curl

curl -O http://www.openss7.org/repos/tarballs/strx25-0.9.2.1.tar.bz2

If ui got stuck on Ubuntu

compiz --replace

Find all empty files

find  /path/to/dest -type f -empty

Add ssh keys and start ssh daemon

eval `ssh-agent -s`
ssh-add ~/.ssh/id_rsa
/usr/sbin/sshd

Output date/time in ISO 8601 format up to seconds without time belt

date -Is | sed 's/+.*//'

bash

Bash special dollar sign shell variables

• Positional parameters $1,$2,$3… and their corresponding array representation, count and IFS expansion $@, $#, and $*.
• $- current options set for the shell.
• $$ pid of the current shell (not subshell)
• $_ last argument of last command - most recent parameter (or the abs path of the command to start the current shell immediately after startup)
• $IFS the (input) field separator
• $? most recent foreground pipeline exit status
• $! PID of the most recent background command
• $0 name of the shell or shell script
• $# number of arguments passed to current script
• $* / $@ list of arguments passed to script as string / delimited list

To exit when there is a non-zero status of some command in bash script:

set -e 

But there is better way in bash

trap 'do_something" ERR
trap 'exit' ERR

If statement with search in string

if [[ "big string!" == *"string"* ]]; then echo "yep"; fi

For all of the arguments: !*

ls foo/ bar/
ls !* # Gives the results of ls foo/ bar/

For just the last argument: !$

ls foo/ bar/
ls !$ # Gives the results of ls bar/

If you want a single argument from a list of arguments from the previous command, you can use !!:

ls foo/ bar/ baz/
ls !!:2 # Gives the results of ls bar/
ls foo/ bar/ baz/
ls !!:1 # Gives the results of ls foo/

vim

Vim custom syntax in editor enabling(example is for json)

:source $VIMRUNTIME/syntax/json.vim

vim cheatsheet

visual mode(after esc)

ctrl + v
shift + v

keyword complition in INSERT mode

ctrl + p

switch between windows in vim

ctrl + ww

Easy owrds substitution

# To move between same words press
/<keyword> # to find word
n
ctrl + n
# Then press 'cw' to change this word
cw
# Then press esc to leave INSERT mode, press 'n' and press '.'(dot) to substitute next word

To return to failed session in vim

:recover

Vim navigation through windows:

Open new

:e <filename>

List open windows

:ls

Go to window #2

:b 2

While in insert mode put you in command mode for one key press only

C-o

Go to the beginnig of the line while in insert mode

C-o 0

Go to the first non-whitespace character of the line

^

Som usefull tab configuration

:set expandtab
:set tabstop=4
:set shiftwidth=4

Temporary disabling auto indent for paste

:set paste
# after things are done
:set nopaste

Python

File will be closed after actions - Python

with open("myfile","w") as myFile:
    # do something

Other way

myFile = open("myfile","w")
try:
    # do something with myFile
finally:
    myFile.close()

SQLAlchemy uses SQLite v3 for databases operations, so when trying to open newly created with python script database use "sqlite3" command not just "sqlite"

Oauth credentials can be created here: https://console.developers.google.com/project/737742902183/apiui/credential?authuser=0 OR go to Google developers console -> APIs % auth -> Credentials -> Create new Client ID -> Client ID for native application (Other)

If 127.0.0.1:9001 give the following page, then everything is ok.

<td class="status"><span class="statusrunning">running</span></td>

Supervisord settings so it can be accessed through http

[inet_http_server]
port = 127.0.0.1:9001

Info about supervisor API: http://supervisord.org/api.html

Try this out to look at docs of function of module

<module>.<function>.__doc__

To create and dive into test env for python - in this env you can create deprecated dependecies and install libraries with no harm to your /lib

virtualenv <test_env>
source <test_env>/bin/activate

print will not place \n(next line) after each statement if you place , after print like this

print foo,

Python test condition and raise an exeption if it failed

assert <condition>

Python testing of code

pip install pep8
pip install flake8
pyflakes test.py
pep8 test.py

Time test in python

timeit.timeit('exp(8, 16)', setup='from test2 import exp', number=10000)

list python modules

pip install yolk
yolk -l
pip freeze

get some object details

import inspect
inspect.getmembers(<some_class_or_object>)

use next construction for python logging debug

import logging
logging.basicConfig(level=logging.DEBUG)

Ansible

Specialize user to avoid errors while sshing

ansible -u <user>

use other priv-key

ansible --private-key <private_key> -m <command>

Loops in ansible

• with_fileglob: matches all files in a single directory like - /playbooks/files/fooapp/*
• with_items: traverse over variables
• with_nested: traverse over a nested variables like item[0] and item[1]
• with_dict: traverse over a list of hashes(dictionary), u may use some like item.key and item.value
• with_together: traverse over few lists like ['a','b'], ['1','2'] as a set of lists '(a,1)', '(b,2)'
• with_subelements: traverse over a dict looking for matched key like item.0, item.1
• with_sequence: start:0 end:10 stride:2 format=test%02x traverse over a list of generated numbers
• with_random_choise: makes a random decision upon a variable of a given list
• until: <conditional_expression> until True style loop with given amount of retries and delay between retries
• with_first_found: chose the first existing file(variable) in a given list(optional custom paths/file values)
• with_lines: loop over the results if some program line by line, it is ALWAYS executed on the controle machine, NOT the local machine
• with_index_items: loop over a list but you have list index at item.0 and list value at item.1
• with_flattened: loops over a list if list, but those nested lists been merged

About ansible-playbook command:

Use --tags <tag> with --list-tasks option and --limit <group> with --list-host option to avoid mistakes

Use next pattern to dynamicly group hosts by some paramether in playbook

tasks:
  - group_by: key = {{ ansible_distribution }}

Group created by this pattern can be accessed like this:

- hosts: CentOS

To continue with errors:

ignore_errors: yes

To register return values and other output of command do

register: <var_with_command_results>

Specifing failure behaviour

failed_when: "'FAILED' in <var_with_command_results>.stderr"

Specifing change behaviour

changed_when: "<var_with_command_results>.rc != 2"
changed_when: False # this command will never change :(

Don't invoke shell with echo >> but use lineinfile module from http://docs.ansible.com/lineinfile_module.html

Git

git cli reference

git checkout <branch_name> # changes active branch to branch_name
git checkout -b <branch_name> # creates and changes active branch
git branch <branch_name> # creates new branch
git checkout -- <file_name> # discrads changes in file
git status # status of current git branch
git branch --list # list of git branches
git commit -m "<commit_text>" # make a commit with message
git push -u <init_branch> <dest_branch> # pushes changes to dest_branch in upstream mode
git add <file_name> # adds file_name to current commit
git diff <file1> <file2> # shows diff between file1 and file2
git branch -D <branch_name> # delete branch_name
git pull # updates local repo

git rollback to old commit(or HEAD~1 for rollback by one commit)

git stash save
git reset --hard <old-commit-id>
git push -f

While rabasing, next command will list last 10 commits. Delete commits you dont need any more and save.

git rebase -i HEAD~10

List all last commits

git log

List commits wich are prepared to push

git log origin/master..HEAD
git log --branches --not --remotes

to list last local repo changes

git reflog

Git merge process

git checkout master
git pull origin master
git merge <branch to merge with> -m "<merge message>"
git push origin master

Check is branch up-to-date

git fetch -v --dry-run

Stage All

git add -A

Stage new and modified, without deleted

git add .

Stage modified and deleted, without new

git add -u

Apply local changes to another branch

git stash save
git checkout <branch_name>
git stash pop

List stash

git stash list

List all remotes

git remote -v

Adding new upstream remote repo

git remote add upstream https://github.com/octocat/Spoon-Knife.git

Syncing local repo with upstream repo

git fetch upstream
git checkout master
git merge upstream/master

Delete local branch

# Merged
git branch -d <branchName>
# Unmerged
git branch -D <branchName>

Delete remote branch

git push origin --delete <branchName>

Colored double sided diff

icdiff <file_1> <file_2>
git icdiff <file>

remove file from remote, but keep a local copy

git rm --cached <filename>

Tmux

tmux cheat sheet

• C-a s - to switch between sessions
• C-a z - to make current window full screen
• C-a a - go to start of the line
• C-e - go to end of the line
• C-w - delete last word

.bashrc config for auto tmux start

if [[ ! $TERM =~ screen ]]; then
    exec tmux
fi

Chef

Install bundler -> install all gem from Gemfile using bundler -> Run librarian-chef install to install all comunity cookbooks from Cheffile

cd ~/Downloads/dexter/labs/zookeeper/chef
gem install bundler
bundle install
sudo librarian-chef install

Regarding SSL certificates verification chef 12.0.1 issue

1. Verify all HTTPS connections (recommended)

ssl_verify_mode :verify_peer

2. OR, Verify only connections to chef-server

verify_api_cert true

Manually install gem using rvm

sudo /usr/local/rvm/rubies/ruby-2.1.5/bin/gem install ipaddr_extensions

Sublime Text 3

Toggle side bar

<C-kb> (Ctrl+kb)

To show context help

<CS-p> (Ctrl+Shift+p)

Etcd

etcd cli reference

etcdctl get skydns/stealthly/us-east-1a/us-east-1/bdoss-dev/bastion
dig @localhost SRV bastion.bdoss-dev.us-east-1.us-east-1a.stealthly

dig any joelgm.me +trace +all

etcdctl ls

curl -XPUT http://127.0.0.1:4001/v2/keys/skydns/local/skydns/carbon -d value='{"Port":2003,"Host": "172.17.0.13"}'
dig +short A carbon.skydns.local

Vagrant

To run vagrant box without reprovisioning

vagrant up --no-provision

To provision multiple vagrant boxes in parallel

vagrant status | awk -F' ' '/virtualbox/ {print $1}' | xargs -n 1 -P 8 vagrant up

Docker

One liner to stop / remove all of Docker containers

docker stop $(docker ps -a -q)
docker rm $(docker ps -a -q)

Fix docker SELinux issue

chcon -Rt svirt_sandbox_file_t /path/to/volume

Fix docker access to cutom ports(like dns) issue

iptables -F

Mesos

Sample marathon container config: nginx-1.json

{
  "id": "nginx-1",
  "container": {
    "type": "DOCKER",
    "docker": {
      "image": "nginx:1.7.7",
      "network": "HOST"
    }
  },
  "instances": 1,
  "cpus": 0.5,
  "mem": 320,
  "ports": [0,80]
}

curl -X POST -H "Content-Type: application/json" http://127.0.0.1:8080/v2/apps -d@nginx-1.json

Sample marathon container config with port mapping: nginx-2.json

{
  "id": "nginx-2",
  "container": {
    "type": "DOCKER",
    "docker": {
      "image": "nginx:1.7.7",
      "network": "BRIDGE",
      "portMappings": [
        { "containerPort": 80, "hostPort": 0, "servicePort": 80, "protocol": "tcp" }
      ]
    }
  },
  "instances": 1,
  "cpus": 0.5,
  "mem": 320
}

curl -X POST -H "Content-Type: application/json" http://127.0.0.1:8080/v2/apps -d@nginx-2.json

Marathon config for dockerized mesos-dns

{
  "id": "mesos-dns",
  "cmd": "/tmp/mesos-dns -v -config=/tmp/config.json",
  "container": {
    "type": "DOCKER",
    "docker": {
      "image": "ubuntu:14.04",
      "network": "BRIDGE",
      "portMappings": [
        { "containerPort": 53, "hostPort": 0, "servicePort": 53, "protocol": "tcp" }
      ]
    },
    "volumes": [
      {
        "containerPath": "/tmp",
        "hostPath": "/usr/local/mesos-dns",
        "mode": "RO"
      }
    ]
  },
  "instances": 1,
  "cpus": 0.5,
  "mem": 400
}

curl -X POST -H "Content-Type: application/json" http://127.0.0.1:8080/v2/apps -d@/tmp/mesos-dns.json

Marathon config for raw mesos-dns

{
"cmd": "sudo /usr/local/mesos-dns/mesos-dns -v -config=/usr/local/mesos-dns/config.json",
"cpus": 0.5,
"mem": 400,
"id": "mesos-dns",
"instances": 1,
"constraints": [["hostname", "CLUSTER", "10.0.0.176"]],
"ports": [53]
}

##### Testing mesos-dns docker container
```sh
sudo docker run -v /usr/local/mesos-dns:/tmp mesosphere/mesos-dns /bin/sh -c '/tmp/mesos-dns -v -config /tmp/config.json'

Add following attribute to mesos-slave config /etc/mesos-slave/resources to enable dns port assignment

ports(*):[31000-32000, 53-53]

To run mesos-dns

sudo /usr/local/mesos-dns/mesos-dns -v -config=/usr/local/mesos-dns/config.json

Run queries on mesos master API

curl http://${MASTER_IP}:5050/master/state.json
curl http://${MASTER_IP}:5050/master/state.json | jq [.slaves[].hostname] | jq -r 'join(",")'
curl -sSfLk -m 10 -H 'Accept: text/plain' http://${MASTER_IP}:5050/master/state.json | jq .slaves[].hostname

Utils

Easy to up http server

python -m SimpleHTTPServer

Python serial connection

pip install pyserial
python -m serial.tools.miniterm -h

Markdown debugging

pip install grip
grip ~/Documents/os_comms

p2pcv missing dependencie library

sudo apt-get install libpulse-dev 

AWS

Check console output of ec2 instance using boto

from boto import ec2
ec2_connection = ec2.connect_to_region("us-east-1", aws_access_key_id='', aws_secret_access_key='')
rs = ec2_connection.get_all_instances()
x = [i for r in rs for i in r.instances if "i-47788517" in str(i)][0]
output = x.get_console_output()
print output

Copy file from s3 to local machine

aws s3 cp --region us-east-1 s3://bdoss-deploy/mesos/mesos-dns/mesos-dns /usr/local/bin/mesos-dns

Run queries against AWS API

aws ec2 describe-instances --region us-east-1 --filters "Name=tag:Name,Values=mesos-slave.test.bdoss-dev" | grep Host

Minotaur

Basic deployment procedure

./sns.py -e dummy -r us-east-1 -t cloudformation-notifications
./sns.py -e dummy -r us-east-1 -t autoscaling-notifications
./vpc.py -e dummy -r us-east-1 -c 10.0.0.0/21
./subnet.py -e dummy -r us-east-1 -z us-east-1a -p private -c 10.0.0.0/23
./subnet.py -e dummy -r us-east-1 -z us-east-1a -p public -c 10.0.2.0/24
./nat.py -e dummy -r us-east-1 -z us-east-1a
./bastion.py -e dummy -r us-east-1 -z us-east-1a
./zookeeper.py -e dummy -d test -r us-east-1 -z us-east-1a

dummy key is dexter.pub

Commit to minotaur with caution, dont commit iampolicies template without deleting jenkins group

After each hadoop redeploy clean zookeeper

sudo /opt/apache/zookeeper/zookeeper-3.4.6/bin/zkCli.sh
rmr /chef
ls /

There must be 2 and only 2 name nodes for HA
There must be 3 or more journal nodes for ligitimate quorum

minotaur lab deploy clouderahadoop journalnode -e bdoss-dev -d test -r us-east-1 -z us-east-1a -n 3
minotaur lab deploy clouderahadoop namenode -e bdoss-dev -d test -r us-east-1 -z us-east-1a -n 2
minotaur lab deploy clouderahadoop resourcemanager -e bdoss-dev -d test -r us-east-1 -z us-east-1a
minotaur lab deploy clouderahadoop datanode -e bdoss-dev -d test -r us-east-1 -z us-east-1a

Save local changes using git stash save and execute pull upstream. Create new branch git checkout -b feature and start working.

To use dev repo

git clone https://git@github.com/alexgear/minotaur.git \"$REPO_DIR\"\ncd \"$REPO_DIR\"\ngit checkout feature\ncd

TODO: Add public ip association for zookeeper node

TODO: There are different subversions for mesos and marathon versions. This must be handled dynamicly.

Debug mesos slave start

service mesos-slave start | awk '{ print $4 }' | xargs strace -p 

Master chef run

export mesos_version=0.21.0
export marathon_version=0.7.5
export mesos_dns=false
export marathon=true
export aurora=false
export slave_on_master=false
export chronos=true
export zk_version=3.4.6
export mesos_masters=10.0.2.182
export mesos_masters_eip=54.84.22.122
export hosted_zone_name=bdoss.org
export zk_servers=10.0.1.248
export cassandra_servers=10.0.0.251
export kafka_servers=10.0.1.169
export aurora_url=
export spark=true
export spark_version=1.2.1
export spark_url=
export gauntlet=true
chef-solo -c /deploy/repo/labs/mesos/chef/solo.rb -j /deploy/repo/labs/mesos/chef/solo_master.json

Slave chef run

export mesos_version=0.21.0
export zk_version=3.4.6
export zk_servers=10.0.0.208
export cassandra_master=10.0.1.84
export kafka_servers=10.0.0.205
export mesos_masters=10.0.2.95
export mesos_masters_eip=54.173.15.68
export hosted_zone_name=bdoss.net
export mesos_dns=false
export gauntlet=true
export mirrormaker=true
chef-solo -c /deploy/repo/labs/mesos/chef/solo.rb -j /deploy/repo/labs/mesos/chef/solo_slave.json

Straight-forward gauntlet framework run using shell

# Find zookeeper, kafka and cassandra nodes that belong to the same deployment and environment
export DEPLOYMENT=dev
export ENVIRONMENT=bdoss-dev
NODES_FILTER="Name=tag:Name,Values=zookeeper.$DEPLOYMENT.$ENVIRONMENT"
QUERY="Reservations[].Instances[].NetworkInterfaces[].PrivateIpAddress"
export ZK_SERVERS=$(aws ec2 describe-instances --region "$REGION" --filters "$NODES_FILTER" --query "$QUERY" | jq --raw-output 'join(",")')
NODES_FILTER="Name=tag:Name,Values=cassandra.$DEPLOYMENT.$ENVIRONMENT"
export CASSANDRA_SERVERS=$(aws ec2 describe-instances --region "$REGION" --filters "$NODES_FILTER" --query "$QUERY" | jq --raw-output 'join(",")')
NODES_FILTER="Name=tag:Name,Values=kafka.$DEPLOYMENT.$ENVIRONMENT"
export KAFKA_SERVERS=$(aws ec2 describe-instances --region "$REGION" --filters "$NODES_FILTER" --query "$QUERY" | jq --raw-output 'join(",")')

export REGION=us-east-1
aws s3 cp --region $REGION s3://bdoss-deploy/kafka/mirrormaker/mirror_maker /usr/local/bin/mirror_maker
chmod +x /usr/local/bin/mirror_maker
echo -e "zookeeper.connect=${ZK_SERVERS}:2181" > /tmp/consumer.config
echo -e "metadata.broker.list=${KAFKA_SERVERS}:9092\n\
timeout=10s" > /tmp/producer.config

aws s3 cp --region $REGION s3://bdoss-deploy/mesos/spark/spark-1.2.0-bin-1.0.4.tgz /tmp/spark-1.2.0-bin-1.0.4.tgz
# aws s3 cp --region $REGION s3://bdoss-deploy/mesos/spark/spark-1.2.0.tgz /tmp/spark-1.2.0.tgz
# mkdir /usr/local/spark
tar -xzf /tmp/spark-1.2.0-bin-1.0.4.tgz -C /opt
mv /opt/spark-1.2.0-bin-1.0.4 /opt/spark
# tar -xzf /tmp/spark-1.2.0.tgz -C /opt
# mv /opt/spark-1.2.0 /opt/spark
echo -e "export MASTER=mesos://zk://${ZK_SERVERS}:2181/mesos\n\
export MESOS_NATIVE_LIBRARY=/usr/local/lib/libmesos.so\n\
export SPARK_EXECUTOR_URI=http://d3kbcqa49mib13.cloudfront.net/spark-1.2.1-bin-hadoop2.4.tgz" > /opt/spark/conf/spark-env.sh
echo -e "spark.master mesos://zk://${ZK_SERVERS}:2181/mesos\n\
spark.executor.uri http://d3kbcqa49mib13.cloudfront.net/spark-1.2.1-bin-hadoop2.4.tgz\n\
spark.mesos.coarse true" > /opt/spark/conf/spark-defaults.conf
echo -e "metadata.broker.list=${KAFKA_SERVERS}:9092" >> /opt/gauntlet/producer.properties

cd /opt/gauntlet
./run.sh 1

SPARK

##### [Spark mirror url](http://apache.ip-connect.vn.ua/spark/spark-1.2.0/spark-1.2.0.tgz)

##### Run spark shell for debugging purpose
```sh
./bin/spark-shell --master mesos://zk://10.0.2.164:2181/mesos

Testing spark-shell

# You need to build spark to run spark shell
/opt/spark/bin/spark-shell

# Once in spark-shell run the following skala code
sc.parallelize(1 to 1000).count()

Chef

Clone repository and checkout to development branch

git node['mesos']['gauntlet']['install_dir'] do
  repository "http://github.com/alexgear/repo"
  action :sync
end

bash 'checkout to development repository' do
  user 'root'
  cwd '/path/to/develop/branch'
  code "git checkout -b develop origin/develop"
  not_if "git status | grep develop", :cwd => '/path/to/develop/branch'
end

Zookeeper

zookeeper test connection via ruby

#!/usr/bin/env ruby
require zookeeper
z = Zookeeper.new("#{`cat /etc/mesos/zk`}")
zdata = Hash.new{ |h,k| h[k] = Hash.new(&h.default_proc) }
data = z.get(:path => zdata['master'])[:data]
puts data

Jenkins

Fix require tty error

visudo
# add the following lines. ALL=(ALL) NOPASSWD: ALL
# Comment this line "Defaults requiretty"

Give process ability to survive after build is complete

if [[ $(ps aux | grep node | grep -v grep) == *node* ]]
  then killall node
fi
/usr/local/sbin/daemonize -E BUILD_ID=dontKillMe -E PORT=8000 -o ./api.log -e ./api.err -c ./ /usr/bin/node express

Networking

SRV DNS records are ultimately cool, but they are not supported by any of modern browsers (there is a feature request on mozilla bugtracker which date from 1999 so there is a very little of hope). They can be used for loadbalancing and port mapping.

_sip._tcp.example.com. 86400 IN SRV 0 5 5060 sipserver.example.com.

Curl give no route to host - check iptables(firewalld) rules and add custom like

# Squid proxy firewall rule
firewall-cmd --zone=public --add-port=3128/tcp --permanent
# Node express firewall rule
firewall-cmd --zone=public --add-port=3030/tcp --permanent
firewall-cmd --reload 

TEMP

Full text search using grep

grep -rl "string" /path

Add box to vagrant

vagrant box add trusty https://cloud-images.ubuntu.com/vagrant/trusty/trusty-server-cloudimg-amd64-juju-vagrant-disk1.box

Easy to use cpu benchmark

openssl speed sha1

Create new Postgresql user (-E --encrypted -P --pwprompt)

createuser -E -P graphite

Create new Postgresql database (-O --owner)

createdb -O graphite graphite

Add user to group

sudo usermod -a -G groupName userName
sudo adduser userName groupName

Hex dump of file

xxd fileName

Nginx ssl configuration generator

Test responses to fake urls

curl -L --resolve fake.url.com:80:$(dig +short url.com | tail -n 1) http://fake.url.com -v

To keep env variables while doing sudo use sudo visudo and add the following

Defaults env_keep += "http_proxy SOMEOTHERVARIABLES ANOTHERVARIABLE ETC"

iotop can be run in batch mode instead of the default interactive mode using the -b option. -o is used to show only processes actually doing I/O, and -qqq is to suppress column names and I/O summary. See man iotop for more options.

iotop -boqqq

Using conditionals (if statement) inside of ansible playbook

- name: Write swapfile
  command: |
    {% if swapfile_use_dd %}
    dd if=/dev/zero of={{ swapfile_location }} bs=1M count={{ swapfile_size }} creates={{ swapfile_location }}
    {% else %}
    fallocate -l {{ swapfile_size }} {{ swapfile_location }} creates={{ swapfile_location }}
    {% endif %}
  register: write_swapfile
  when: swapfile_size != false

Logstash docs

List of nice ansible playbooks

• logstash
• sensu jonhadfield's fork
• sensu my fork
• rabbit my fork
• make it possible to add custom props for sensu client
• supervisord

Loop over a dict in jinja2

dict.items()
dict.keys()
dict.values()

Using journalctl

journalctl --dmesg
journalctl --output=json-pretty UNIT=firewalld.service

Efficient mount options

mount -o rw,noexec,nodev,noatime,nodiratime,nobarrier

Use noop (kinda FIFO) scheduler on SSD disks

sudo echo noop > /sys/block/<device-name>/queue/scheduler

Ultra low latency ping

ping 10.1.7.218 -i0.000005 -c50000 -s 16

merge old with new whisper db

sudo find * -type f -exec whisper-fill.py {} ../graphite_novalocal-a/{} \;
sudo find * -type f -exec rm {} \;

Network statistics

netstat -s

Validate certificate SSL

openssl ocsp -issuer Symantec_Class_3_EV_SSL_CA_G3.crt -CAfile root_plus_intermediates.pem -nonce -cert cert.pem -url http://ocsp.verisign.com

Test SSL connection for OSCP and other

echo QUIT | openssl s_client -connect example.com:443 -status 2> /dev/null

To test bandwith and latency via tcp - run

# On fisrt host
qperf
# On second host
qperf $IP1 tcp_bw tcp_lat

To fix bad blocks

sudo badblocks -nsv /dev/sda > bad-blocks
fsck -t ext4 -l /tmp/bad-blocks /dev/sda
# If /dev/sda is a system volume
/sbin/shutdown -r -F now

Create disk partition using parted

parted /dev/sdc mklabel msdos
parted /dev/sdc mkpart primary ext4 1 100%
parted print free
parted rm 1

Calculate number of Placement Groups in ceph cluster

for i in 0 1 2 3; do echo  "osd.$i=$(sudo ceph pg dump 2>/dev/null | grep '^3.' | awk '{print $15;}' | grep $i | wc -l) pgs"; done

Inject config in running ceph cluster

ceph tell osd.* injectargs '--rbd_cache_max_dirty_age = 1'

Inspect running config of ceph cluster via admin socket

ceph --admin-daemon /var/run/ceph/ceph-osd.0.asok config show | grep 'rbd_cache_max_dirty_age ='

Delete a user

azure vm extension set $VMNAME VMAccessForLinux Microsoft.OSTCExtensions '1.*' -i '{"remove_user": "usernametoremove"}'

Reset the SSH key (Create new user with the SSH key)

azure vm extension set $VMNAME VMAccessForLinux Microsoft.OSTCExtensions '1.*' -i '{"username": "currentusername", "ssh_key": "contentofsshkey"}'

Reset the SSH configuration

azure vm extension set $VMNAME VMAccessForLinux Microsoft.OSTCExtensions '1.*' -i '{"reset_ssh": "True"}'

Change ceph journal to tmpfs

OSD_ID=1
service ceph stop osd
sed -i 's/^#*\s*#*journal dio = false/        journal dio = false/' /etc/ceph/ceph.conf
ceph-osd --flush-journal -i ${OSD_ID}
rm -r /var/lib/ceph/ceph-${OSD_ID}
mount -t tmpfs -o size=1G,nr_inodes=1k,mode=0700 tmpfs /var/lib/ceph/journal/
mkdir /var/lib/ceph/journal/ceph-${OSD_ID}
ceph-osd --mkjournal -i ${OSD_ID}
service ceph start osd

HTTP Apache benchmark

ab -n 1000 -c 100 http://testserver/

Mount volumes in openstack using this options to prevent ceph going crazy

sudo umount /dev/vdc1
sudo mkfs.xfs /dev/vdc1 -f
sudo mount -o rw,relatime,seclabel,attr2,inode64,noquota /dev/vdc1 /opt/carbon/storage/whisper/

Port forwarding

echo '1' | sudo tee /proc/sys/net/ipv4/conf/eth0/forwarding
iptables -t nat -A PREROUTING -p tcp -i ppp0 --dport 8001 -j DNAT --to-destination 192.168.1.200:8080
iptables -A FORWARD -p tcp -d 192.168.1.200 --dport 8080 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT

Utility to performance test graphite

~/repos/velux-deploy/graphite_perf_test_go -host=10.3.2.8:5000 -proto=tcp -threads=4 -simul 240 -connections=240 -points 1000
~/repos/velux-deploy/graphite_perf_test_go -host=10.3.2.8:5000 -proto=tcp -threads=4 -simul 1 -connections=1 -points 100000
java -jar ~/repos/graphite-stresser/dist/stresser.jar 10.3.2.8 2203 12 128 1 false

Easy to use disk stats

iostat -c 1 2 /dev/sda1
ioping -c 10 .

Tweaking kernel and mount options to maximize xfs performance

sudo mkfs.xfs -f -n size=64k -l size=64m -d agcount=45 /dev/vdb
mount -o remount,nobarrier,logbufs=8,logbsize=256k,allocsize=2M,noatime,nodiratime,delaylog

sudo sysctl vm.dirty_background_ratio=0 vm.dirty_background_bytes=209715200 vm.dirty_ratio=40 vm.dirty_bytes=0 vm.dirty_writeback_centisecs=100 vm.dirty_expire_centisecs=200

[new]
vm.dirty_background_ratio = 10 -> 0
vm.dirty_background_bytes = 0 -> 209715200 # 200 MBytes
vm.dirty_ratio = 20 -> 40
vm.dirty_bytes = 0 -> 0
vm.dirty_writeback_centisecs = 500 -> 100
vm.dirty_expire_centisecs = 3000 -> 200

echo 2 > /sys/block/sdb/queue/rq_affinity; echo cfq > /sys/block/xvdb/queue/scheduler; echo 256 > /sys/block/xvdb/queue/nr_requests; echo 256 > /sys/block/xvdb/queue/read_ahead_kb