高可用的mysql galera集群部署

一：集群机器介绍
四台机器：
1.balance节点安装haproxy和keepalived
机器名：
balance01 172.18.48.1
balance02 172.18.48.2
2.galera节点安装mysql数据库和galera
机器名：
galera01 172.18.48.3
galera02 172.18.48.4
操作系统：ubuntu14.04 server64

注：每台机器/etc/hosts上要写上涉及到的所有对应的ip和主机名

二：balance节点安装

balance节点安装配置haproxy和keepalived

1./etc/sysctl.conf添加
vim /etc/sysctl.conf
net.ipv4.ip_nonlocal_bind=1

2.加载sysctl.conf
sysctl -p

3.安装haproxy和keepalived
apt-get install -y keepalived haproxy

4.创建/var/lib/haproxy
mkdir /var/lib/haproxy

5.把/var/lib/haproxy权限改为root所有
chown root:root /var/lib/haproxy/

6.vim /etc/keepalived/keepalived.conf
balance01添加如下：
global_defs {
notification_email {
root@[YOUR_DOMAIN_NAME]
}
notification_email_from keepalived@[YOUR_DOMAIN_NAME]
smtp_server localhost
smtp_connect_timeout 30
router_id balance01
}
vrrp_script haproxy {
script "killall -0 haproxy"
interval 2
weight 2
}
vrrp_instance 50 {
virtual_router_id 50
advert_int 1
priority 101
state MASTER
interface eth0
virtual_ipaddress {
172.18.48.20 dev eth0
}
track_script {
haproxy
}
}

balance02如下：
global_defs {
notification_email {
root@[YOUR_DOMAIN_NAME]
}
notification_email_from keepalived@[YOUR_DOMAIN_NAME]
smtp_server localhost
smtp_connect_timeout 30
router_id balance02
}
vrrp_script haproxy {
script "killall -0 haproxy"
interval 2
weight 2
}
vrrp_instance 50 {
virtual_router_id 50
advert_int 1
priority 101
state MASTER
interface eth0
virtual_ipaddress {
172.18.48.20 dev eth0
}
track_script {
haproxy
}
}

7.vim /etc/haproxy/haproxy.cfg

balance01上添加如下：
global
chroot /var/lib/haproxy
daemon
group haproxy
log 172.18.48.1 local0
maxconn 4000
pidfile /var/run/haproxy.pid
stats socket /var/lib/haproxy/stats
user haproxy
defaults
log global
maxconn 8000
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout check 10s
listen mysql_cluster
bind 172.18.48.20:3306
mode tcp
balance roundrobin
option mysql-check user root
option tcpka
server galera01 172.18.48.3:3306
server galera02 172.18.48.4:3306

balance02添加如下：
global
chroot /var/lib/haproxy
daemon
group haproxy
log 172.18.48.2 local0
maxconn 4000
pidfile /var/run/haproxy.pid
stats socket /var/lib/haproxy/stats
user haproxy
defaults
log global
maxconn 8000
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout check 10s
listen mysql_cluster
bind 172.18.48.20:3306
mode tcp
balance roundrobin
option mysql-check user root
option tcpka
server galera01 172.18.48.3:3306
server galera02 172.18.48.4:3306
8.balance节点修改/etc/default/haproxy
ENABLED=1

9.启动keepalived和haproxy
service keepalived restart
service haproxy restart

三：galera节点安装

(一)安装MariaDB，所有galera节点

1.安装软件源
sudo apt-get install software-properties-common
sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xcbcb082a1bb943db
sudo add-apt-repository 'deb http://mirrors.hustunique.com/mariadb/repo/10.0/ubuntu trusty main'

2.安装MariaDB
sudo apt-get update
sudo apt-get install mariadb-server

(二)安装galera cluster，所有galera节点

1.安装软件安装源
apt-get install python-software-properties
apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0xcbcb082a1bb943db
add-apt-repository 'deb http://mirror3.layerjet.com/mariadb/repo/5.5/ubuntu precise main'
apt-get update

2.安装galera包
DEBIAN_FRONTEND=noninteractive apt-get install -y rsync galera mariadb-galera-server
3.配置galera cluster
/etc/mysql/conf.d/galera.cnf
[mysqld]
mysql settings
binlog_format=ROW
default-storage-engine=innodb
innodb_autoinc_lock_mode=2
query_cache_size=0
query_cache_type=0
bind-address=0.0.0.0
galera settings
wsrep_provider=/usr/lib/galera/libgalera_smm.so
wsrep_cluster_name="my_wsrep_cluster"
wsrep_cluster_address="gcomm://172.18.48.3,172.18.48.4"
wsrep_sst_method=rsync
4.galera01和galera02关闭mysql
galera01 service mysql stop
galera02 service mysql stop
5.启动集群，第一个启动的节点要加上集群初始化命令，相当于主节点
galera01 service mysql start --wsrep-new-cluster
galera02 service mysql start
6.检查集群规模
galera01 mysql -u root -e 'SELECT VARIABLE_VALUE as "cluster size" FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME="wsrep_cluster_size"'
+--------------+
| cluster size |
+--------------+
| 2 |
+--------------+
7.在galera上创建数据库，并授权允许远程访问
mysql>create database nova;
mysql>GRANT ALL ON nova.* TO 'nova'@'%' IDENTIFIED BY 'password';
四：balance节点和galera的弹性和容灾
添加新节点时候直接重启服务即可，galera节点必须有一个主节点，即执行如下语句的节点：
service mysql start --wsrep-new-cluster