This ansibles script is intended to be a simple script in order to install the vmware postgresql package and configure the pg_autofailover framework on the machine.
Pg autofailvoer is an automatic failover mechanism for postgres supported by vmware. It is based on the concept of monitor, primary and replica node. Have a look here for further details:
https://github.com/citusdata/pg_auto_failover
The script uses a python virtual env so you need first to:
virtualenv venv
. venv/bin/activate
pip install --upgrade setuptools pip
pip install -r requirements.txt
First step is to setup the host you want the postgresql distro + pgautofailover to be installed.
you can start editing the hosts file:
[targets]
host0 ansible_host=192.168.12.138
host1 ansible_host=192.168.12.137
host2 ansible_host=192.168.12.136
use host0 for the host you would like to install the monitor, host1 for the primary and host2 for the replica.
Use the script copykey.yaml in order to copy the public key from your director machine to the 3 target machines in order to allow the next script to be executed ssh passwordless
ansible-playbook --user osboxes copykey.yaml --ask-become-pass
the root password will be asked for the copy exchange
the main script uses the following variables:
vmw_postgres_package: /Users/dpalaia/projects/ansible/ansible-101/bin/vmware-postgres-13.2-0.el7.x86_64.rpm
postgres_systemd: /Users/dpalaia/projects/ansible/ansible-101/conf/postgresql.service
pgautofailover_systemd: /Users/dpalaia/projects/ansible/ansible-101/conf/pgautofailover.service
data_dir: /var/lib/pgsql/datanew
host0: 192.168.12.138
host1: 192.168.12.137
host2: 192.168.12.136
host0, host1 and host2 should be the same you defined in the host file.
vmw_postgres_package is the postgresql vmware distro to install
postgres_systemd and pgautofailover_systemd are two generic systemd file for postgres and pgautofailover in order to register a systemd file on the machine.
data_dir: is the datadir to use for the postgresql install process
Once you set up these variables you can simply run the script:
ansible-playbook --user osboxes pg-autofailover.yml --ask-become-pass
as user you can choose a user able to do sudo on the system.
These are the steps done by the script:
(venv) dpalaia@dpalaia-a02 ansible-101 % ansible-playbook --user osboxes simple-postgres.yml --ask-become-pass
BECOME password:
PLAY [PgAutofailover and Vmware postgresql installation process] *************************************************************************************************************************************************************************************************************
TASK [Gathering Facts] *******************************************************************************************************************************************************************************************************************************************************
ok: [host0]
ok: [host2]
ok: [host1]
TASK [mkdir /home/osboxes/postgres] ******************************************************************************************************************************************************************************************************************************************
ok: [host2]
ok: [host0]
ok: [host1]
TASK [copy vmware postgresql RPMs to /home/osboxes/postgres] *****************************************************************************************************************************************************************************************************************
ok: [host2] => (item=/Users/dpalaia/projects/ansible/ansible-101/./vmware-postgres-11.7-3.el7.x86_64.rpm)
ok: [host1] => (item=/Users/dpalaia/projects/ansible/ansible-101/./vmware-postgres-11.7-3.el7.x86_64.rpm)
ok: [host0] => (item=/Users/dpalaia/projects/ansible/ansible-101/./vmware-postgres-11.7-3.el7.x86_64.rpm)
TASK [local RPMs not found] **************************************************************************************************************************************************************************************************************************************************
skipping: [host0]
skipping: [host1]
skipping: [host2]
TASK [set_fact] **************************************************************************************************************************************************************************************************************************************************************
ok: [host0]
ok: [host1]
ok: [host2]
TASK [install RPMs] **********************************************************************************************************************************************************************************************************************************************************
ok: [host0]
ok: [host2]
ok: [host1]
TASK [copy generic postgresql systemd file in /etc/systemd/system] ***********************************************************************************************************************************************************************************************************
ok: [host2]
ok: [host0]
ok: [host1]
TASK [copy generic pgautofailover systemd file in /etc/systemd/system] *******************************************************************************************************************************************************************************************************
changed: [host2]
changed: [host0]
changed: [host1]
TASK [Initialize pgautofailover create the monitor] **************************************************************************************************************************************************************************************************************************
changed: [host0 -> 192.168.12.138]
TASK [Pause for 5 minutes to build app cache] ********************************************************************************************************************************************************************************************************************************
Pausing for 120 seconds
(ctrl+C then 'C' = continue early, ctrl+C then 'A' = abort)
Press 'C' to continue the play or 'A' to abort
ok: [host0]
TASK [Initialize pgautofailover create the primary] **************************************************************************************************************************************************************************************************************************
changed: [host0 -> 192.168.12.137]
TASK [Pause for 5 minutes to build app cache] ********************************************************************************************************************************************************************************************************************************
Pausing for 120 seconds
(ctrl+C then 'C' = continue early, ctrl+C then 'A' = abort)
Press 'C' to continue the play or 'A' to abort
ok: [host0]
TASK [Initialize pgautofailover create the replica] **************************************************************************************************************************************************************************************************************************
changed: [host0 -> 192.168.12.136]
TASK [Restart service pgautofailover on centos, in all cases, also issue daemon-reload to pick up config changes] ************************************************************************************************************************************************************
changed: [host0]
changed: [host1]
changed: [host2]
PLAY RECAP *******************************************************************************************************************************************************************************************************************************************************************
host0 : ok=13 changed=5 unreachable=0 failed=0 skipped=1 rescued=0 ignored=0
host1 : ok=8 changed=2 unreachable=0 failed=0 skipped=1 rescued=0 ignored=0
host2 : ok=8 changed=2 unreachable=0 failed=0 skipped=1 rescued=0 ignored=0
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