MariaDB-in-Docker

mariadb container master-slave replication with health Monitoring

Automatically deploy environment by;

Running the deploy_config.sh after clonning the Repo to you Server.

Environment prep and manually deploy

sudo apt update

Installing the Docker engine incase its not installed yet

sudo apt-get remove docker docker-engine docker.io

sudo apt install docker.io

sudo systemctl start docker

sudo systemctl enable docker

logout then login again to enable user rights incase they don't apply immediately

sudo groupadd docker

sudo gpasswd -a "${USER}" docker

usermod -aG docker "${USER}"

Create the database persistent volume to be mounted

mkdir -p /opt/mariadb/master-data

Grant Permissions

sudo chown -R 1001:1001 /opt/mariadb/master-data/

Running containers in dettached mode but when you remove the "-d" it could help with debugging the running configs in the container!

docker run -d or docker-compose up -d

To login to a container

docker exec -it $container_id bash

mariadb

$ mysql -u my_user -p
  #my_password

after login check databases

show databases;
use my_databse;

then create table form there

exit;

check or configure replication

$ mysql -u root -p
  #master_root_password

then

show master status;

To import:

docker exec -i adprcc3ms_mariadb-master_1 mysql -uroot -pmaster_root_password my_database < mariadb-master-dump.sql

To export:

docker exec -i adprcc3ms_mariadb-master_1 mysqldump -uroot -pmaster_root_password my_database > mariadb-master-dump.sql

Stop and backup the currently running container, Uncomment the following lines

docker stop $container_id

rsync -a /opt/mariadb/master-data /opt/mariadb/master-data.bkp.$(date +%Y%m%d-%H.%M.%S)

incase you want to scale up number of slaves or scale down

docker-compose up --detach --scale mariadb-master=1 --scale mariadb-slave=3

To clean up

docker stop $container_id

docker rm $container_id

You can also remove all images and stopped contaners using

docker prune -a

Run the following to see if the cronjob you've defined actually runs.

sudo grep CRON /var/log/syslog

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