[优化篇]Ubuntu使用corosync+pacemaker+drbd实现MySQL的HA(1)
环境
- Ubuntu 14.04.2
- MySQL1：192.168.12.101
- MySQL2：192.168.12.102
- VIP：192.168.12.200
每台MySQL机器都新添加/dev/sdb，当然也可以使用已有的sda做分区。
实施步骤
（1代表mysql1，2代表mysql2，以下类同）
软件安装（1+2）
sudo apt-get install pacemaker corosync heartbeat crmsh cluster-glue resource-agents mysql-server sysv-rc-conf
drbd8-utils说明：sysv-rc-conf是一个可视化管理服务器自启动的工具，属于可选
1、保证两台机器时间同步（1+2）
2、SSH可以使用root无密码访问（1+2）
修改/etc/ssh/sshd_config让ssh支持以root用户登录, 并重启 service ssh restart
#PermitRootLogin without-password
PermitRootLogin yes机器1：
ssh-keygen -t rsa -P ''ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.12.103机器2：
ssh-keygen -t rsa -P ''ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.12.101测试双方是否可以无密码访问
ssh root@192.168.12.1033、在一个节点上生成corosync key, 然后拷贝到其他所有节点. 生成key时会默认会调用/dev/random随机数设备，一旦系统中断的IRQS的随机数不够用，将会产生大量的等待时间，所以将random替换成urandom（1）
mv /dev/{random,random.bak}
ln -s /dev/urandom /dev/random4、生成corosync的key文件，然后同步到另外一台机器（1）
corosync-keygen
scp /etc/corosync/authkey root@192.168.12.103:/etc/corosync/
chown root:root /etc/corosync/authkey
chmod 400 /etc/corosync/authkey5、取消corosync、pacemaker、drbd的开机启动（1+2）
sysv-rc-conf使用空格把drbd,pacemaker,corosync有X的地方取消掉，q退出
6、修改corosync.conf配置文件（1+2）
root@mysql1:~# cat /etc/corosync/corosync.conf
# Please read the openais.conf.5 manual page
totem {
version: 2
# How long before declaring a token lost (ms)
token: 10000
# How many token retransmits before forming a new configuration
token_retransmits_before_loss_const: 10
# How long to wait for join messages in the membership protocol (ms)
join: 60
# How long to wait for consensus to be achieved before starting a new round of membership configuration (ms)
consensus: 3600
# Turn off the virtual synchrony filter
vsftype: none
# Number of messages that may be sent by one processor on receipt of the token
max_messages: 20
# Limit generated nodeids to 31-bits (positive signed integers)
clear_node_high_bit: yes
# Disable encryption
secauth: on
# How many threads to use for encryption/decryption
threads: 0
# Optionally assign a fixed node id (integer)
# nodeid: 1234
# This specifies the mode of redundant ring, which may be none, active, or passive.
rrp_mode: active
interface {
# The following values need to be set based on your environment
ringnumber: 0
bindnetaddr: 192.168.12.0
mcastaddr: 226.94.1.1
mcastport: 5405
}
}
amf {
mode: disabled
}
service{
ver: 1
name: pacemaker
}
quorum {
# Quorum for the Pacemaker Cluster Resource Manager
provider: corosync_votequorum
expected_votes: 1
}
aisexec {
user: root
group: root
}
logging {
fileline: off
to_stderr: yes
to_logfile: no
to_syslog: yes
syslog_facility: daemon
debug: off
timestamp: on
logger_subsys {
subsys: AMF
debug: off
tags: enter|leave|trace1|trace2|trace3|trace4|trace6
}
}7、配置/etc/default/corosync(1+2)
root@mysql2:~# cat /etc/default/corosync
# start corosync at boot [yes|no]
START=yes重启corosync服务
查看corosync状态
corosync-cfgtool -s
corosync-quorumtool -l重启pacemaker服务
查看状态
root@mysql2:~# crm status
Last updated: Fri Aug 14 10:01:57 2015
Last change: Fri Aug 14 09:17:34 2015 via crm_attribute on mysql1
Stack: corosync
Current DC: mysql1 (1084755045) - partition with quorum
Version: 1.1.10-42f2063
2 Nodes configured
0 Resources configured
Online: [ mysql1 mysql2 ]8、为drbd创建存储磁盘（1+2）
fdisk /dev/sdb9、创建drbd的mysql资源(1+2)
root@mysql2:~# cat /etc/drbd.d/mysql.res
resource mysql {
device /dev/drbd0;
disk /dev/sdb1;
meta-disk internal;
on mysql1 {
address 192.168.12.101:7788;
}
on mysql2 {
address 192.168.12.103:7788;
}
syncer {
rate 10M;
}
}添加drbd到/etc/modules
echo -e 'drbd # -> added' >> /etc/modulesdump出mysql信息
root@mysql2:~# drbdadm dump mysql
# resource mysql on mysql2: not ignored, not stacked
# defined at /etc/drbd.d/mysql.res:1
resource mysql {
on mysql1 {
volume 0 {
device /dev/drbd0 minor 0;
disk /dev/sdb1;
meta-disk internal;
}
address ipv4 192.168.12.101:7788;
}
on mysql2 {
volume 0 {
device /dev/drbd0 minor 0;
disk /dev/sdb1;
meta-disk internal;
}
address ipv4 192.168.12.103:7788;
}
disk {
resync-rate 10M;
}
}初始化DRBD元数据
drbdadm create-md mysql创建/dev/drbd0设备文件，将指定的后端存储设备附加到该DRBD资源，同时建立所有节点服务器的通信连接。
drbdadm up mysql验证
drbd-overview10、创建drbd0文件系统（1）
drbdadm -- --overwrite-data-of-peer primary mysql执行如下操作，该操作是在同步信息，你可以不停刷新，直至同步100%成功为止
cat /proc/drbd对/dev/drbd0格式化文件系统
本例使用了ext4文件系统，也可以用更为高效的xfs文件系统
mkfs.ext4 /dev/drbd0创建一个存储数据库文件的路径
mkdir -p /data/mysql将drbd0对象mount到该路径下
mount /dev/drbd0 /data/mysql注意：如果出现mount错误，例如；
mount: block device /dev/drbd0 is write-protected, mounting read-only mount: Wrong medium type因为mount只能在primary一端使用，所以需要执行如下，再mount
drbdadm primary mysql可以在mysql1机器创建一个文件夹testfile，然后umount，再将mysql1设置为secondary对mysql2进行测试
mkdir -p /data/mysql/testfile
umount /dev/drbd0
drbdadm secondary mysql11、另外一台机器进行测试（2）
drbdadm primary mysql
mkfs.ext4 /dev/drbd0
mkdir /data/mysql
mount /dev/drbd0 /data/mysql
ll /data/mysql如果执行ll命令可以看到新创建的testfile说明配置成功
umount /dev/drbd0
drbdadm secondary mysql12、将mysql1设置为primary(1)
drbdadm primary mysql