Docker 搭建pxc集群 + haproxy + keepalived 高可用（一）

一、首先需要安装好docker，安装方法可以参考之前一篇博文Centos7安装docker

[root@localhost ~]# systemctl start docker
[root@localhost ~]# systemctl enable docker         设置开机启动docker　
[root@localhost ~]# docker version
Client:
 Version:           18.09.3
 API version:       1.39
 Go version:        go1.10.8
 Git commit:        774a1f4
 Built:             Thu Feb 28 06:33:21 2019
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.3
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.8
  Git commit:       774a1f4
  Built:            Thu Feb 28 06:02:24 2019
  OS/Arch:          linux/amd64
  Experimental:     false

验证docker是OK的

　　

1、由于后面容器间通讯需要防火墙转发，所以需要开通IPv4转发

[root@localhost ~]# vim  /usr/lib/sysctl.d/00-system.conf
添加 net.ipv4.ip_forward=1
[root@localhost ~]# systemctl restart network

2、先下载percona/percona-xtradb-cluster镜像

[root@localhost~]# docker pull percona/percona-xtradb-cluster

[root@localhost~]# docker tag docker.io/percona/percona-xtradb-cluster pxc 将镜像名称修改为一个方便使用的名称

　3、创建pxc集群需要使用的网络

[root@localhost ~]# docker network create --subnet=172.18.0.0/24 pxc_network　 　指定特定的网段

二、创建第一个节点master

1、创建数据卷，用于挂载容器里面数据库的信息，这样容器销毁或者损坏，数据可以不丢失

[root@localhost ~]# docker volume create v1
v1
[root@localhost ~]# docker volume create v2
v2
[root@localhost ~]# docker volume create v3
v3
我们这里需要创建三个容器，所以需要三个挂载卷
/var/lib/docker/volumes/
容器创建的配置文件存放在这个目录下面

2、创建第一个节点　

[root@pxc13 ~]# docker run -d -p 3306:3306 -e \
MYSQL_ROOT_PASSWORD=mysql -e \
CLUSTER_NAME=PXC -e XTRABACKUP_PASSWORD=mysql \
-v v1:/var/lib/mysql --privileged --name=node1 \
--net=pxc_network --ip=172.18.0.2 pxc
d4a38ad90b3d477769deb6a3ad983bd0235e48bed16eb8387f4891540a2eec80

参数解释：
CLUSTER_NAME：集群名称
XTRABACKUP_PASSWORD：集群数据同步密码
--net：使用自己定义的网络

3、查看日志

[root@pxc13 ~]# docker logs node1
Running --initialize-insecure on /var/lib/mysql/
total 0
drwxr-xr-x 2 mysql mysql   6 Mar 25 06:35 .
drwxr-xr-x 1 root  root  105 Feb 28 15:56 ..
2019-03-25T06:35:48.615251Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2019-03-25T06:35:48.615390Z 0 [Warning] WSREP: Node is running in bootstrap/initialize mode. Disabling pxc_strict_mode checks
2019-03-25T06:35:50.636233Z 0 [Warning] InnoDB: New log files created, LSN=45790

从日志来看，第一个节点启动成功

4、检测链接情况，能否正常连接

　　

三、创建其他两个节点

[root@pxc13 ~]# docker run -d -p 3307:3306 \
-e MYSQL_ROOT_PASSWORD=mysql -e CLUSTER_NAME=PXC -e XTRABACKUP_PASSWORD=mysql -e CLUSTER_JOIN=node1\
 -v v2:/var/lib/mysql --privileged --name=node2\
 --net=pxc_network --ip=172.18.0.3 pxc
4020e30aa38b4c9e513418f3f9485d02721ba4e64794daaa8321028a2aab8fcf

创建第二个节点

[root@pxc13 ~]# docker run -d -p 3308:3306 \
-e MYSQL_ROOT_PASSWORD=mysql -e CLUSTER_NAME=PXC -e XTRABACKUP_PASSWORD=mysql -e CLUSTER_JOIN=node1\
 -v v3:/var/lib/mysql --privileged --name=node3 \
--net=pxc_network --ip=172.18.0.4 pxc
0b96bbce1e000bebfcef144e98e61fbc68d7e833fd3ba1e7d182fea4dcf7907d

创建第三个节点

参数解释：

CLUSTER_JOIN：同步哪一个节点的数据

三、到此，我们三节点的pxc集群以及启动成功，用navicat连接三个数据库进行测试

4、可以用命令行查看集群的状态

mysql> show status like 'wsrep%';
+----------------------------------+-------------------------------------------------+
| Variable_name                    | Value                                           |
+----------------------------------+-------------------------------------------------+
| wsrep_local_state_uuid           | 427613f5-4ec8-11e9-abe4-429d2cd3ad07            |
| wsrep_protocol_version           | 9                                               |
| wsrep_last_applied               | 16                                              |
| wsrep_last_committed             | 16                                              |
| wsrep_replicated                 | 2                                               |
| wsrep_replicated_bytes           | 464                                             |
| wsrep_repl_keys                  | 3                                               |
| wsrep_repl_keys_bytes            | 72                                              |
| wsrep_repl_data_bytes            | 251                                             |
| wsrep_repl_other_bytes           | 0                                               |
| wsrep_received                   | 10                                              |
| wsrep_received_bytes             | 800                                             |
| wsrep_local_commits              | 0                                               |
| wsrep_local_cert_failures        | 0                                               |
| wsrep_local_replays              | 0                                               |
| wsrep_local_send_queue           | 0                                               |
| wsrep_local_send_queue_max       | 1                                               |
| wsrep_local_send_queue_min       | 0                                               |
| wsrep_local_send_queue_avg       | 0.000000                                        |
| wsrep_local_recv_queue           | 0                                               |
| wsrep_local_recv_queue_max       | 2                                               |
| wsrep_local_recv_queue_min       | 0                                               |
| wsrep_local_recv_queue_avg       | 0.100000                                        |
| wsrep_local_cached_downto        | 15                                              |
| wsrep_flow_control_paused_ns     | 0                                               |
| wsrep_flow_control_paused        | 0.000000                                        |
| wsrep_flow_control_sent          | 0                                               |
| wsrep_flow_control_recv          | 0                                               |
| wsrep_flow_control_interval      | [ 173, 173 ]                                    |
| wsrep_flow_control_interval_low  | 173                                             |
| wsrep_flow_control_interval_high | 173                                             |
| wsrep_flow_control_status        | OFF                                             |
| wsrep_cert_deps_distance         | 1.000000                                        |
| wsrep_apply_oooe                 | 0.000000                                        |
| wsrep_apply_oool                 | 0.000000                                        |
| wsrep_apply_window               | 1.000000                                        |
| wsrep_commit_oooe                | 0.000000                                        |
| wsrep_commit_oool                | 0.000000                                        |
| wsrep_commit_window              | 1.000000                                        |
| wsrep_local_state                | 4                                               |
| wsrep_local_state_comment        | Synced                                          |
| wsrep_cert_index_size            | 2                                               |
| wsrep_cert_bucket_count          | 22                                              |
| wsrep_gcache_pool_size           | 2136                                            |
| wsrep_causal_reads               | 0                                               |
| wsrep_cert_interval              | 0.000000                                        |
| wsrep_open_transactions          | 0                                               |
| wsrep_open_connections           | 0                                               |
| wsrep_ist_receive_status         |                                                 |
| wsrep_ist_receive_seqno_start    | 0                                               |
| wsrep_ist_receive_seqno_current  | 0                                               |
| wsrep_ist_receive_seqno_end      | 0                                               |
| wsrep_incoming_addresses         | 172.18.0.2:3306,172.18.0.3:3306,172.18.0.4:3306 |
| wsrep_cluster_weight             | 3                                               |
| wsrep_desync_count               | 0                                               |
| wsrep_evs_delayed                |                                                 |
| wsrep_evs_evict_list             |                                                 |
| wsrep_evs_repl_latency           | 0/0/0/0/0                                       |
| wsrep_evs_state                  | OPERATIONAL                                     |
| wsrep_gcomm_uuid                 | 4d5462bd-4ec8-11e9-809a-96f76f03bbb9            |
| wsrep_cluster_conf_id            | 3                                               |
| wsrep_cluster_size               | 3                                               |
| wsrep_cluster_state_uuid         | 427613f5-4ec8-11e9-abe4-429d2cd3ad07            |
| wsrep_cluster_status             | Primary                                         |
| wsrep_connected                  | ON                                              |
| wsrep_local_bf_aborts            | 0                                               |
| wsrep_local_index                | 0                                               |
| wsrep_provider_name              | Galera                                          |
| wsrep_provider_vendor            | Codership Oy <info@codership.com>               |
| wsrep_provider_version           | 3.35(rddf9876)                                  |
| wsrep_ready                      | ON                                              |
+----------------------------------+-------------------------------------------------+
71 rows in set

mysql>

四、创建第二个分片，第二个分片也是三个节点的pxc集群

1、先创建数据卷v4、v5、v6

[root@pxc13 ~]# docker volume create v4
v1
[root@pxc13 ~]# docker volume create v5
v2
[root@pxc13 ~]# docker volume create v6
v3

2、创建三个容器

[root@localhost ~]# docker run -d -p 3316:3306 -e \
MYSQL_ROOT_PASSWORD=mysql -e \
CLUSTER_NAME=PXC2 -e XTRABACKUP_PASSWORD=mysql \
-v v4:/var/lib/mysql --privileged --name=node4 \
--net=pxc_network --ip=172.18.0.5 pxc

[root@localhost ~]# docker run -d -p 3317:3306 -e\
MYSQL_ROOT_PASSWORD=mysql -e \
CLUSTER_NAME=PXC2 -e XTRABACKUP_PASSWORD=mysql\
-e CLUSTER_JOIN=node4\ -v v5:/var/lib/mysql --privileged --name=node5\
--net=pxc_network --ip=172.18.0.6 pxc

[root@localhost ~]# docker run -d -p 3318:3306 -e\
MYSQL_ROOT_PASSWORD=mysql -e \
CLUSTER_NAME=PXC2 -e XTRABACKUP_PASSWORD=mysql\
-e CLUSTER_JOIN=node4\-v v6:/var/lib/mysql --privileged --name=node6 \
--net=pxc_network --ip=172.18.0.7 pxc　

这样我们就有了两个分片的pxc集群