Commits on Feb 15, 2022

1. Support Galera Replication …

   This patch add support for Galera replication.
   
   Features:
   - It detects if Galera replication was enabled wsrep_on=ON
   - By default it enables cluster auto bootstrap feature
   - By default the first cluster node is used for cluster auto bootstrapping
     based on the wsrep_cluster_address parameter or by setting the
     `WSREP_CLUSTER_ADDRESS` environment variable
   - cluster auto bootstrap feature can be disabled by setting the
     `WSREP_SKIP_AUTO_BOOTSTRAP` environment variable
   - use the `WSREP_AUTO_BOOTSTRAP_ADDRESS` environment variable to explicitly
     choice other node for cluster bootstrapping
   - cluster node hostnames or IP addresses must be valid to enable cluster
     auto bootstrapping
   
   How to use it.
   
   1. Prepare MariaDB configuration file `galera.cnf`:
   
   ```plaintext
   [galera]
   wsrep_on                       = ON
   wsrep_sst_method               = mariabackup
   wsrep_provider                 = /usr/lib/libgalera_smm.so
   binlog_format                  = row
   default_storage_engine         = InnoDB
   innodb_doublewrite             = 1
   innodb_autoinc_lock_mode       = 2
   ```
   
   2. Make it read-only:
   
   ```plaintext
   chmod 444 galera.cnf
   ```
   
   3. Prepare Docker Compose file `docker-compose.yml`:
   
   ```yaml
   services:
       node:
           image: mariadb
           restart: always
           security_opt:
               - label=disable
           environment:
               WSREP_CLUSTER_ADDRESS: "${WSREP_CLUSTER_ADDRESS:-}"
               MARIADB_ROOT_PASSWORD: example
           volumes:
               - ./galera.cnf:/etc/mysql/conf.d/10-galera.cnf:ro
           command:
               - --wsrep-cluster-address=gcomm://db_node_1,db_node_2,db_node_3
           deploy:
               replicas: 3
   ```
   
   4. Start Docker Compose:
   
   ```plaintext
   docker-compose --project-name db up
   ```
   
   To start N MariaDB instances using environment variable:
   
   ```plaintext
   WSREP_CLUSTER_ADDRESS="gcomm://db_node_1,db_node_2,db_node_3,db_node_4,db_node_5"
   docker-compose --project-name db up --scale node="$(echo "${WSREP_CLUSTER_ADDRESS}" | tr ',' ' ' | wc -w)"
   ```
   
   To start N MariaDB instances using MariaDB configuration file:
   
   ```plaintext
   docker-compose --project-name db up --scale node="$(grep -i wsrep_cluster_address <name>.cnf | tr -d ' ' | tr ',' ' ' | wc -w)"
   ```
   
   Closes: MariaDB#28

   

   tymonx authored and grooverdan committed Feb 15, 2022
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2. MDEV-25667: check gvwstate.dat before bootstrap

   

   grooverdan committed Feb 15, 2022
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