first checkin

roles/mysql/README.md

+# MYSQL FOR SLURM
+
+The Mysql for slurm is problematic, as configuring the database is no longer simple.
+Ansible commands such as mysql_user do not work in a brand new system, as it appears
+mysql/maria db must run in a root shell and Ansible breaks at this point.
+
+The preferred approach.
+
+1) Run this role. It may/may not break when trying to modify the database as the root password is not set.
+2) Login to sql machine. sudo as root
+3) Run /usr/bin/mysql_secure_installation  Set the root password to what is found in our Ansible scripts, i.e.
+    ansible-vault edit vars/passwords.yml 
+    Key to change is "sqlrootPasswd"
+4). The datbase by default is in /var/lib which is on a small Unix disk partition. You need to change it.
+    Several options exist.
+     a) Set up a soft pointer, i.e.  /var/lib/mysql -> /vdb/mysql OR
+     b) Modify /etc/my.cnf.d/mariadb-server.cnf and point to a new location
+         i.e.
+'''
+[mysqld]
+datadir=/mnt/vdb1/var_lib_mysql
+socket=/mnt/vdb1/var_lib_mysql/mysql.sock
+log-error=/var/log/mariadb/mariadb.log
+pid-file=/run/mariadb/mariadb.pid
+'''
+
+5) The procures will be something like this:
+a) systemctl stop mariadb
+b) mkdir /mnt/vdb1/var_lib_mysql
+c) chown mysql:mysql /mnt/vdb1/var_lib_mysql
+d) cp -rp /var/lib/mysql/* /mnt/vdb1/var_lib_mysql
+e) systemctl start mariadb
+f) Use `systemctl status mariadb` and view `/var/log/mariadb/mariadb.log` to trace errors
+
+6) None of the above is in the ansible scripts. The `sql` role is tagged as **never** due to these complications
+7) The access mechanisms to this role have been modified, so users can hardcode the SLURM controllers directly.
+
+Sample usage
+'''
+- role: mysql
+      vars:
+         mysql_type: "mysql_server"
+         mysql_root_password: "{{ sqlrootPasswd }}"
+         mysql_user_name: "slurmdb"
+         mysql_user_db_name: "slurm_acct_db"
+         current_slurm_mgmt_nodes_fqdn: " {{ current_slurm_mgmt_nodes_fqdn }} "
+         current_slurm_mgmt_nodes_short: " {{ current_slurm_mgmt_nodes_short }} "
+         mysql_user_password: "{{ slurmdb_passwd }}"
+  tags: [ database, mysql, never ]
+'''
+
+where
+
+'''
+- set_fact:
+         current_slurm_mgmt_nodes_fqdn:
+                  - 'm3-mgmt3.massive.org.au'
+                  - 'm3-mgmt4.massive.org.au'
+         current_slurm_mgmt_nodes_short:
+                  - 'm3-mgmt3'
+                  - 'm3-mgmt4'
+'''
+