├── Dockerfile ├── LICENSE ├── README.md └── scripts ├── init_cluster_conf.sh ├── init_galera_user.sh ├── init_galera_user.sql ├── init_maxscale_user.sh └── init_maxscale_user.sql /Dockerfile: -------------------------------------------------------------------------------- 1 | FROM mariadb:10.1 2 | MAINTAINER toughiq@gmail.com 3 | 4 | RUN apt-get update && apt-get upgrade -y \ 5 | && rm -rf /var/lib/apt/lists/* 6 | 7 | COPY scripts/ /docker-entrypoint-initdb.d/. 8 | 9 | # we need to touch and chown config files, since we cant write as mysql user 10 | RUN touch /etc/mysql/conf.d/galera.cnf \ 11 | && chown mysql.mysql /etc/mysql/conf.d/galera.cnf \ 12 | && chown mysql.mysql /docker-entrypoint-initdb.d/*.sql 13 | 14 | # we expose all Cluster related Ports 15 | # 3306: default MySQL/MariaDB listening port 16 | # 4444: for State Snapshot Transfers 17 | # 4567: Galera Cluster Replication 18 | # 4568: Incremental State Transfer 19 | EXPOSE 3306 4444 4567 4568 20 | 21 | # we set some defaults 22 | ENV GALERA_USER=galera \ 23 | GALERA_PASS=galerapass \ 24 | MAXSCALE_USER=maxscale \ 25 | MAXSCALE_PASS=maxscalepass \ 26 | CLUSTER_NAME=docker_cluster \ 27 | MYSQL_ALLOW_EMPTY_PASSWORD=1 28 | 29 | CMD ["mysqld"] 30 | 31 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | [![Docker Pulls](https://img.shields.io/docker/pulls/toughiq/mariadb-cluster.svg)](https://hub.docker.com/r/toughiq/mariadb-cluster/) 2 | [![](https://images.microbadger.com/badges/image/toughiq/mariadb-cluster.svg)](https://microbadger.com/images/toughiq/mariadb-cluster "Get your own image badge on microbadger.com") 3 | 4 | # docker-mariadb-cluster 5 | __Version 2__ 6 | Dockerized Automated MariaDB Galera Cluster 7 | 8 | Version 2 is the advanced branch and is featured on DockerHub as `latest` from now on. 9 | Old version 1.0 can be found here: https://github.com/toughIQ/docker-mariadb-cluster/tree/v1. 10 | To get V1.0 Docker images, just `docker pull toughiq/mariadb-cluster:1.0` 11 | 12 | The idea of this project is to create an automated and fully ephemeral MariaDB Galera cluster. 13 | No static bindings, no persistent volumes. Like a disk RAID the data gets replicated across the cluster. 14 | If one node fails, another node will be brought up and the data will be initialized. 15 | 16 | __Consider this a POC and not a production ready system!__ 17 | 18 | Built for use with Docker __1.12.1__+ in __Swarm Mode__ 19 | 20 | # WORK in Progress! 21 | 22 | See [Issues](https://github.com/toughIQ/docker-mariadb-cluster/issues) for known problems and [Wiki](https://github.com/toughIQ/docker-mariadb-cluster/wiki) for notes and ideas. 23 | 24 | ## Setup 25 | ### Init Swarm Nodes/Cluster 26 | 27 | Swarm Master: 28 | 29 | docker swarm init 30 | 31 | Additional Swarm Node(s): 32 | 33 | docker swarm join :2377 + join-tokens shown at swarm init 34 | 35 | To get the tokens at a later time, run `docker swarm join-token (manager|worker)` 36 | 37 | ### Create DB network 38 | 39 | docker network create -d overlay mydbnet 40 | 41 | ### Init/Bootstrap DB Cluster 42 | 43 | At first we start with a new service, which is set to `--replicas=1` to turn this instance into a bootstrapping node. 44 | If there is just one service task running within the cluster, this instance automatically starts with `bootstrapping` enabled. 45 | 46 | docker service create --name dbcluster \ 47 | --network mydbnet \ 48 | --replicas=1 \ 49 | --env DB_SERVICE_NAME=dbcluster \ 50 | toughiq/mariadb-cluster 51 | 52 | Note: the service name provided by `--name` has to match the environment variable __DB_SERVICE_NAME__ set with `--env DB_SERVICE_NAME`. 53 | 54 | Of course there are the default MariaDB options to define a root password, create a database, create a user and set a password for this user. 55 | Example: 56 | 57 | docker service create --name dbcluster \ 58 | --network mydbnet \ 59 | --replicas=1 \ 60 | --env DB_SERVICE_NAME=dbcluster \ 61 | --env MYSQL_ROOT_PASSWORD=rootpass \ 62 | --env MYSQL_DATABASE=mydb \ 63 | --env MYSQL_USER=mydbuser \ 64 | --env MYSQL_PASSWORD=mydbpass \ 65 | toughiq/mariadb-cluster 66 | 67 | ### Scale out additional cluster members 68 | Just after the first service instance/task is running with we are good to scale out. 69 | Check service with `docker service ps dbcluster`. The result should look like this, with __CURRENT STATE__ telling something like __Running__. 70 | 71 | ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR 72 | 7c81muy053eoc28p5wrap2uzn dbcluster.1 toughiq/mariadb-cluster node01 Running Running 41 seconds ago 73 | 74 | Lets scale out now: 75 | 76 | docker service scale dbcluster=3 77 | 78 | This additional 2 nodes start will come up in "cluster join"-mode. Lets check again: `docker service ps dbcluster` 79 | 80 | ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR 81 | 7c81muy053eoc28p5wrap2uzn dbcluster.1 toughiq/mariadb-cluster node01 Running Running 6 minutes ago 82 | 8ht037ka0j4g6lnhc194pxqfn dbcluster.2 toughiq/mariadb-cluster node02 Running Running about a minute ago 83 | bgk07betq9pwgkgpd3eoozu6u dbcluster.3 toughiq/mariadb-cluster node03 Running Running about a minute ago 84 | 85 | ### Create MaxScale Proxy Service and connect to DBCluster 86 | 87 | There is no absolute need for a MaxScale Proxy service with this Docker Swarm enabled DB cluster, since Swarm provides a loadbalancer. So it would be possible to connect to the cluster by using the loadbalancer DNS name, which is in our case __dbcluster__. Its the same name, which is provided at startup by `--name`. 88 | 89 | But MaxScale provides some additional features regarding loadbalancing database traffic. And its an easy way to get information on the status of the cluster. 90 | 91 | Details on this MaxScale image can be found here: https://github.com/toughIQ/docker-maxscale 92 | 93 | docker service create --name maxscale \ 94 | --network mydbnet \ 95 | --env DB_SERVICE_NAME=dbcluster \ 96 | --env ENABLE_ROOT_USER=1 \ 97 | --publish 3306:3306 \ 98 | toughiq/maxscale 99 | 100 | To disable root access to the database via MaxScale just set `--env ENABLE_ROOT_USER=0` or remove this line at all. 101 | Root access is disabled by default. 102 | 103 | ### Check successful startup of Cluster & MaxScale 104 | Execute the following command. Just use autocompletion to get the `SLOT` and `ID`. 105 | 106 | docker exec -it maxscale.. maxadmin -pmariadb list servers 107 | 108 | The result should report the cluster up and running: 109 | 110 | -------------------+-----------------+-------+-------------+-------------------- 111 | Server | Address | Port | Connections | Status 112 | -------------------+-----------------+-------+-------------+-------------------- 113 | 10.0.0.3 | 10.0.0.3 | 3306 | 0 | Slave, Synced, Running 114 | 10.0.0.4 | 10.0.0.4 | 3306 | 0 | Slave, Synced, Running 115 | 10.0.0.5 | 10.0.0.5 | 3306 | 0 | Master, Synced, Running 116 | -------------------+-----------------+-------+-------------+-------------------- 117 | 118 | 119 | -------------------------------------------------------------------------------- /scripts/init_cluster_conf.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | set -e 4 | 5 | # we set gcomm string with cluster_members via ENV by default 6 | CLUSTER_ADDRESS="gcomm://$CLUSTER_MEMBERS?pc.wait_prim=no" 7 | 8 | # we use dns service discovery to find other members when in service mode 9 | # and set/override cluster_members provided by ENV 10 | if [ -n "$DB_SERVICE_NAME" ]; then 11 | 12 | # we check, if we have to enable bootstrapping, if we are the only/first node live 13 | if [ `getent hosts tasks.$DB_SERVICE_NAME|wc -l` = 1 ] ;then 14 | # bootstrapping gets enabled by empty gcomm string 15 | CLUSTER_ADDRESS="gcomm://" 16 | else 17 | # we fetch IPs of service members 18 | CLUSTER_MEMBERS=`getent hosts tasks.$DB_SERVICE_NAME|awk '{print $1}'|tr '\n' ','` 19 | # we set gcomm string with found service members 20 | CLUSTER_ADDRESS="gcomm://$CLUSTER_MEMBERS?pc.wait_prim=no" 21 | fi 22 | fi 23 | 24 | 25 | # we create a galera config 26 | config_file="/etc/mysql/conf.d/galera.cnf" 27 | 28 | cat < $config_file 29 | # Node specifics 30 | [mysqld] 31 | # next 3 params disabled for the moment, since they are not mandatory and get changed with each new instance. 32 | # they also triggered problems when trying to persist data with a backup service, since also the config has to be 33 | # persisted, but HOSTNAME changes at container startup. 34 | #wsrep-node-name = $HOSTNAME 35 | #wsrep-sst-receive-address = $HOSTNAME 36 | #wsrep-node-incoming-address = $HOSTNAME 37 | 38 | # Cluster settings 39 | wsrep-on=ON 40 | wsrep-cluster-name = "$CLUSTER_NAME" 41 | wsrep-cluster-address = $CLUSTER_ADDRESS 42 | wsrep-provider = /usr/lib/galera/libgalera_smm.so 43 | wsrep-provider-options = "gcache.size=256M;gcache.page_size=128M;debug=no" 44 | wsrep-sst-auth = "$GALERA_USER:$GALERA_PASS" 45 | wsrep_sst_method = rsync 46 | binlog-format = row 47 | default-storage-engine = InnoDB 48 | innodb-doublewrite = 1 49 | innodb-autoinc-lock-mode = 2 50 | innodb-flush-log-at-trx-commit = 2 51 | EOF 52 | -------------------------------------------------------------------------------- /scripts/init_galera_user.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | set -e 4 | 5 | # we use .sh file to create a .sql file, which will be parsed afterwards due to alphabetical sorting 6 | config_file="/docker-entrypoint-initdb.d/init_galera_user.sql" 7 | 8 | # We start config file creation 9 | 10 | cat < $config_file 11 | GRANT ALL PRIVILEGES on *.* to '$GALERA_USER'@'%' identified by '$GALERA_PASS'; 12 | EOF 13 | -------------------------------------------------------------------------------- /scripts/init_galera_user.sql: -------------------------------------------------------------------------------- 1 | # Template file for on the fly config 2 | -------------------------------------------------------------------------------- /scripts/init_maxscale_user.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | set -e 4 | 5 | # we use .sh file to create a .sql file, which will be parsed afterwards due to alphabetical sorting 6 | 7 | config_file="/docker-entrypoint-initdb.d/init_maxscale_user.sql" 8 | 9 | # We start config file creation 10 | 11 | cat < $config_file 12 | CREATE USER '$MAXSCALE_USER'@'%' identified by '$MAXSCALE_PASS'; 13 | GRANT SELECT on mysql.user to '$MAXSCALE_USER'@'%'; 14 | GRANT SELECT ON mysql.db TO '$MAXSCALE_USER'@'%'; 15 | GRANT SELECT ON mysql.tables_priv TO '$MAXSCALE_USER'@'%'; 16 | GRANT REPLICATION CLIENT ON *.* to $MAXSCALE_USER@'%'; 17 | GRANT SHOW DATABASES ON *.* TO '$MAXSCALE_USER'@'%'; 18 | EOF 19 | -------------------------------------------------------------------------------- /scripts/init_maxscale_user.sql: -------------------------------------------------------------------------------- 1 | # Template file for on the fly config 2 | --------------------------------------------------------------------------------