Update dhcpd to work in shared network (#77)

playbooks/roles/ocp-config/README.md

@@ -28,6 +28,7 @@ Role Variables
 | chronyconfig.enabled    | no       | true           | Set to true to enable chrony configuration on the bastion node during installation. This also configure the bastion as a NTP server for the cluster. |
 | chronyconfig.content    | no       | ""             | List of time NTP servers and options pair (see chronyconfig examples). If empty, bastion will try sync with some default ntp server (internet) AND local HW clock (with higher stratum). |
 | chronyconfig.allow      | no       | ""             | List of network cidr (X.X.X.X/Y) allowed to sync with bastion configured as NTP server |
+| dhcp_shared_network     | no       |                | Flag to update DHCP server work on a shared network. (Neither ACK nor NACK unknown clients) |
 
 *chronyconfig variable example *
 

playbooks/roles/ocp-config/tasks/dhcpd_update.yaml

@@ -0,0 +1,24 @@
+---
+# Update dhcpd config to not deny unknown clients and use only static entries
+- name: Find DHCP pool block
+  shell: grep 'pool {' /etc/dhcp/dhcpd.conf
+  ignore_errors: yes
+  register: dhcp_pool
+
+- name: Update DHCP server config
+  when: dhcp_pool.rc == 0
+  block:
+  - name: Remove pool, range and deny statements
+    shell: |
+      sed -i.bak '/pool {/d' /etc/dhcp/dhcpd.conf
+      sed -i '/range /d' /etc/dhcp/dhcpd.conf
+      sed -i '$d' /etc/dhcp/dhcpd.conf
+      sed -i 's/deny unknown-clients/#deny unknown-clients/' /etc/dhcp/dhcpd.conf
+    args:
+      warn: false
+
+  - name: restart dhcpd
+    service:
+      name: dhcpd
+      state: restarted
+      enabled: yes

playbooks/roles/ocp-config/tasks/main.yaml

@@ -1,6 +1,10 @@
 ---
 # tasks file for ocp4 config
 
+- name: Update DHCP server config for shared network
+  import_tasks: dhcpd_update.yaml
+  when: dhcp_shared_network is defined and dhcp_shared_network
+
 - name: Setup Squid proxy server
   import_tasks: squid.yaml
   when: setup_squid_proxy