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op-guide: update ansible deployment steps and wording #483

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Jun 11, 2018
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op-guide: update ansible deployment steps and wording #483

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op-guide: update ansible deployment steps and wording
lilin90 Jun 4, 2018
d219f6d
op-guide: add description under a headline
lilin90 Jun 5, 2018
5b8cbac
Merge branch 'master' into ansible-tidb-improve
lilin90 Jun 11, 2018
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42 changes: 22 additions & 20 deletions op-guide/ansible-deployment.md
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Original file line number Diff line number Diff line change
@@ -1,9 +1,9 @@
---
title: Ansible Deployment
title: Deploy TiDB Using Ansible
category: operations
---

# Ansible Deployment
# Deploy TiDB Using Ansible

## Overview

Expand All @@ -20,7 +20,6 @@ You can use the TiDB-Ansible configuration file to set up the cluster topology,
- Cleaning environment
- Configuring monitoring modules


## Prepare

Before you start, make sure that you have:
Expand Down Expand Up @@ -56,12 +55,6 @@ Before you start, make sure that you have:

Login to the Control Machine using the `tidb` user account and enter the `/home/tidb` directory. Use the following command to download the corresponding version of TiDB-Ansible from GitHub [TiDB-Ansible project](https://github.com/pingcap/tidb-ansible). The default folder name is `tidb-ansible`. The following are examples of downloading various versions, and you can turn to the official team for advice on which version to choose.

Download the 1.0 GA version:

```
git clone -b release-1.0 https://github.com/pingcap/tidb-ansible.git
```

Download the 2.0 version:

```
Expand Down Expand Up @@ -105,7 +98,7 @@ The standard cluster has 6 machines:
- 3 PD nodes
- 3 TiKV nodes

### The cluster topology of single TiKV instance on a single machine
### The cluster topology of a single TiKV instance on each TiKV node

| Name | Host IP | Services |
|:------|:------------|:-----------|
Expand Down Expand Up @@ -146,8 +139,7 @@ The standard cluster has 6 machines:
172.16.10.6
```


### The cluster topology of multiple TiKV instances on a single machine
### The cluster topology of multiple TiKV instances on each TiKV node

Take two TiKV instances as an example:

Expand All @@ -173,13 +165,10 @@ Take two TiKV instances as an example:
[tikv_servers]
TiKV1-1 ansible_host=172.16.10.4 deploy_dir=/data1/deploy tikv_port=20171 labels="host=tikv1"
TiKV1-2 ansible_host=172.16.10.4 deploy_dir=/data2/deploy tikv_port=20172 labels="host=tikv1"
TiKV1-3 ansible_host=172.16.10.4 deploy_dir=/data3/deploy tikv_port=20173 labels="host=tikv1"
TiKV2-1 ansible_host=172.16.10.5 deploy_dir=/data1/deploy tikv_port=20171 labels="host=tikv2"
TiKV2-2 ansible_host=172.16.10.5 deploy_dir=/data2/deploy tikv_port=20172 labels="host=tikv2"
TiKV2-3 ansible_host=172.16.10.5 deploy_dir=/data3/deploy tikv_port=20173 labels="host=tikv2"
TiKV3-1 ansible_host=172.16.10.6 deploy_dir=/data1/deploy tikv_port=20171 labels="host=tikv3"
TiKV3-2 ansible_host=172.16.10.6 deploy_dir=/data2/deploy tikv_port=20172 labels="host=tikv3"
TiKV3-3 ansible_host=172.16.10.6 deploy_dir=/data3/deploy tikv_port=20173 labels="host=tikv3"

[monitoring_servers]
172.16.10.1
Expand All @@ -203,21 +192,34 @@ location_labels = ["host"]

**Edit the parameters in the service configuration file:**

1. For multiple TiKV instances, edit the `end-point-concurrency` and `block-cache-size` parameters in `tidb-ansible/conf/tikv.yml`:
1. For the cluster topology of multiple TiKV instances on each TiKV node, you need to edit the `block-cache-size` parameter in `tidb-ansible/conf/tikv.yml`:

- `end-point-concurrency`: keep the number lower than CPU Vcores
- `rocksdb defaultcf block-cache-size(GB)`: MEM * 80% / TiKV instance number * 30%
- `rocksdb writecf block-cache-size(GB)`: MEM * 80% / TiKV instance number * 45%
- `rocksdb lockcf block-cache-size(GB)`: MEM * 80% / TiKV instance number * 2.5% (128 MB at a minimum)
- `raftdb defaultcf block-cache-size(GB)`: MEM * 80% / TiKV instance number * 2.5% (128 MB at a minimum)

2. If multiple TiKV instances are deployed on a same physical disk, edit the `capacity` parameter in `conf/tikv.yml`:
2. For the cluster topology of multiple TiKV instances on each TiKV node, you need to edit the `high-concurrency`, `normal-concurrency` and `low-concurrency` parameters in the `tidb-ansible/conf/tikv.yml` file:

```
readpool:
coprocessor:
# Notice: if CPU_NUM > 8, default thread pool size for coprocessors
# will be set to CPU_NUM * 0.8.
# high-concurrency: 8
# normal-concurrency: 8
# low-concurrency: 8
```

Recommended configuration: `number of instances * parameter value = CPU_Vcores * 0.8`.

3. If multiple TiKV instances are deployed on a same physical disk, edit the `capacity` parameter in `conf/tikv.yml`:

- `capacity`: (DISK - log space) / TiKV instance number (the unit is GB)

### Description of inventory.ini variables
### Edit variables in the `inventory.ini` file
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This headline has no content, why does it exist?

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@Hoverbear This is resolved.


#### Description of the deployment directory
#### Edit the deployment directory

You can configure the deployment directory using the `deploy_dir` variable. The global variable is set to `/home/tidb/deploy` by default, and it applies to all services. If the data disk is mounted on the `/data1` directory, you can set it to `/data1/deploy`. For example:

Expand Down
4 changes: 2 additions & 2 deletions op-guide/offline-ansible-deployment.md
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Original file line number Diff line number Diff line change
@@ -1,9 +1,9 @@
---
title: Offline Deployment Using Ansible
title: Deploy TiDB Offline Using Ansible
category: operations
---

# Offline Deployment Using Ansible
# Deploy TiDB Offline Using Ansible

## Prepare

Expand Down