CentOS 7.x Cloudstack 4.11 Setup Mariadb server

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To setup mariadb backend database for cloudstack use following steps:

1. Full install CentOS 7.4. Basically we need at least:

   yum -y install epel-release
   yum groupinstall -y "Development Tools"
   yum install -y java-1.8.0-openjdk-devel.x86_64 genisoimage ws-commons-util MySQL-python createrepo

2. Disable Selinux by editing /etc/selinux/config

   SELINUX=disabled

3. Stop & Disable firewalld

   systemctl stop firewalld
   systemctl disable firewalld

4. Set linux system hostname by editing /etc/hostname

   hostname.domain.com

   and also edit /etc/hosts to reflect the same:

   192.168.1.2 hostname.domain.com hostname

5. Install NTP client as following
   1. yum install ntp -y
   2. Edit /etc/ntp.conf' to have:

      server 192.168.2.2

      where 192.168.2.2 is local ntp server

6. Start and enable ntp service

   systemctl start ntpd
   systemctl enable ntpd

7. Install Mariadb using:

   yum install mariadb-server mariadb -y

8. Add below parameters under [mysqld] section in /etc/my.cnf file

   innodb_rollback_on_timeout=1
   innodb_lock_wait_timeout=600
   max_connections=350
   log-bin=mysql-bin
   binlog-format=ROW
   bind-address=0.0.0.0

9. Restart mariadb and enable it on start using:

   systemctl restart mariadb
   systemctl enable mariadb

10. Optionally secure maria db using:

    mysql_secure_installation

    It is important to have root password for remote connections

11. Give grant permission to root user on all databases from any remote machine:

    # mysql -u root -p
    > grant all privileges on  *.* to 'root'@'%' identified by '<secret-root-password>' WITH GRANT OPTION;
    > flush privileges;

    Better option is to give this privilege only from cloudstack management server instead of using '%' (everywhere)

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