add galera

2016-03-21 05:12:44 -07:00
parent 757f993e08
commit 110d8effb9
5 changed files with 193 additions and 0 deletions
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+# Galera Cluser (Experimental)
+
+### Info:
+
+This template creates a MariaDB Galera cluster on top of Rancher. Using the Galera plugin, the MariaDB cluster runs in a multi-master replicated mode. 
+
+When deployed from the catalog, a three node cluster is created with a database, root password, database user and password. The cluster is set up for replication between all of the nodes. The cluster sits behind a light weight proxy layer that forwards all reads/writes to a single server in order for transaction locks. The proxy layer is fronted by a Rancher load balancer. 
+
+Clients should access the cluster through the load balancer so they do not need to be updated in the event of a failure. 
+
+When the cluster is completely stopped and started, user intervention is required to bring it back online. Instructions can be found in the [Galera documentation](http://galeracluster.com/documentation-webpages/quorumreset.html).
+
+The replication mechanism used in the cluster is based on the MySQL dump method. This has the side effect of taking a long time to bring in a new node when there are large data sets.
+
+### Usage:
+
+Once deployed, use a mysql client to connect:
+
+`mysql -u<db_user> -p -h<galera-lb>`
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+mariadb-galera-server:
+  image: rancher/galera:10.0.22-rancher2
+  net: "container:galera"
+  environment:
+    TERM: "xterm"
+    MYSQL_ROOT_PASSWORD: "${mysql_root_password}"
+    MYSQL_DATABASE: "${mysql_database}"
+    MYSQL_USER: "${mysql_user}"
+    MYSQL_PASSWORD: "${mysql_password}"
+  volumes_from:
+    - 'mariadb-galera-data'
+  labels:
+    io.rancher.container.hostname_override: container_name
+  entrypoint: bash -x /opt/rancher/start_galera
+mariadb-galera-data:
+  image: rancher/galera:10.0.22-rancher2
+  net: none
+  environment:
+    MYSQL_ALLOW_EMPTY_PASSWORD: "yes"
+  volumes:
+    - /var/lib/mysql
+    - /etc/mysql/conf.d
+    - /docker-entrypoint-initdb.d
+    - /opt/rancher
+  command: /bin/true
+  labels:
+    io.rancher.container.start_once: true
+galera-leader-forwarder:
+  image: rancher/galera-leader-proxy:v0.1.0
+  net: "container:galera"
+  volumes_from:
+   - 'mariadb-galera-data'
+galera:
+  image: rancher/galera-conf:v0.2.0
+  labels:
+    io.rancher.sidekicks: mariadb-galera-data,mariadb-galera-server,galera-leader-forwarder
+    io.rancher.container.hostname_override: container_name
+    io.rancher.scheduler.affinity:container_label_soft_ne: io.rancher.stack_service.name=$${stack_name}/$${service_name}
+  volumes_from:
+    - 'mariadb-galera-data'
+  stdin_open: true
+  tty: true
+  command: /bin/bash
+
+galera-lb:
+  expose:
+  - 3306:3307/tcp
+  tty: true
+  image: rancher/load-balancer-service
+  links:
+  - galera:galera
+  stdin_open: true
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+.catalog:
+  name: "Galera DB"
+  version: 10.0.22-rancher1
+  description: |
+    Galera Cluster based on MariaDB 10.0.22
+  questions:
+    - variable: "mysql_root_password"
+      type: string
+      required: true
+      label: "MySQL Root Password"
+      description: "Password given to the root mysql user"
+    - variable: "mysql_database"
+      type: string
+      required: true
+      label: "MySQL Database Name"
+      description: "MySQL database to create"
+    - variable: "mysql_user"
+      type: string
+      required: true
+      description: "MySQL user for the created database"
+      label: "MySQL DB User"
+    - variable: "mysql_password"
+      type: string
+      required: true
+      label: "MySQL DB Password"
+      description: "Password for the MySQL user of the created database"
+galera:
+  scale: 3
+  metadata:
+    mysqld: |
+      innodb_file_per_table = 1
+      innodb_autoinc_lock_mode=2
+      query_cache_size=0
+      query_cache_type=0
+      innodb_flush_log_at_trx_commit=0
+      binlog_format=ROW
+      default-storage-engine=innodb
+      wsrep_provider=/usr/lib/galera/libgalera_smm.so
+      wsrep_provider_options="gcache.size = 2G"
+      wsrep_sst_method=mysqldump
+      wsrep_sst_auth=root:${mysql_root_password}
+      progress=1
+galera-lb:
+  scale: 1
+  load_balancer_config: {}
+  health_check:
+    port: 42
+    interval: 2000
+    unhealthy_threshold: 3
+    healthy_threshold: 2
+    response_timeout: 2000