coresync配置

前提:
1)本配置共有两个测试节点,分别node1.magedu.com和node2.magedu.com,相的IP地址分别为172.16.100.67和172.16.100.68;
2)集群服务为nginx服务;
3)提供web服务的地址为172.16.100.53,即vip;
4)系统为CentOS 7.3 x86_64

1、准备工作

为了配置一台Linux主机成为HA的节点,通常需要做出如下的准备工作:

1) 所有节点的主机名称和对应的IP地址解析服务可以正常工作,且每个节点的主机名称需要跟”uname -n“命令的结果保持一致;因此,需要保证两个节点上的/etc/hosts文件均为下面的内容:
172.16.100.67 node1.magedu.com node1
172.16.100.68 node2.magedu.com node2

为了使得重新启动系统后仍能保持如上的主机名称,还分别需要在各节点执行类似如下的命令:

Node1:
hostnamectl set-hostname node1.magedu.com
hostname node1.magedu.com

Node2:
hostnamectl set-hostname node2.magedu.com
hostname node2.magedu.com

2) 设定两个节点可以基于密钥进行ssh通信,这可以通过类似如下的命令实现:
Node1:

ssh-keygen -t rsa -P ''
ssh-copy-id -i ~/.ssh/id_rsa.pub root@node2.magedu.com

Node2:

ssh-keygen -t rsa -P ''
ssh-copy-id -i ~/.ssh/id_rsa.pub root@node1.magedu.com

3) 多节点时间同步

2、安装并启动集群

2.1 安装并启动pcsd

Node1 AND Node2:

yum install -y pacemaker pcs psmisc policycoreutils-python
systemctl start pcsd.service
systemctl enable pcsd.service

echo 'magedu.com' | passwd --stdin hacluster

2.2 配置corosync

Node1 OR Node2:

pcs cluster auth node1.magedu.com node2.magedu.com
Username: hacluster
Password: 
node1.magedu.com: Authorized
node2.magedu.com: Authorized
pcs cluster setup --name mycluster node1.magedu.com node2.magedu.com
Shutting down pacemaker/corosync services...
Redirecting to /bin/systemctl stop  pacemaker.service
Redirecting to /bin/systemctl stop  corosync.service
Killing any remaining services...
Removing all cluster configuration files...
node1.magedu.com: Succeeded
node2.magedu.com: Succeeded

2.3 启动集群

Nod1 OR Node2:

```
node1.magedu.com: Starting Cluster...
node2.magedu.com: Starting Cluster...

上面的命令相当于在各节点分别执行如下命令:
systemctl start corosync.service
systemctl start pacemaker.service

2.4 检查集群启动状态

检查各节点通信状态(显示为no faults即为OK):
corosync-cfgtool -s
Printing ring status.
Local node ID 1
RING ID 0
id = 172.16.100.67
status = ring 0 active with no faults

检查集群成员关系及Quorum API:
corosync-cmapctl | grep members
runtime.totem.pg.mrp.srp.members.1.config_version (u64) = 0
runtime.totem.pg.mrp.srp.members.1.ip (str) = r(0) ip(172.16.100.67)
runtime.totem.pg.mrp.srp.members.1.join_count (u32) = 1
runtime.totem.pg.mrp.srp.members.1.status (str) = joined
runtime.totem.pg.mrp.srp.members.2.config_version (u64) = 0
runtime.totem.pg.mrp.srp.members.2.ip (str) = r(0) ip(172.16.100.68)
runtime.totem.pg.mrp.srp.members.2.join_count (u32) = 1
runtime.totem.pg.mrp.srp.members.2.status (str) = joined

pcs status corosync

Membership information

Nodeid      Votes Name
     1          1 node1.magedu.com (local)
     2          1 node2.magedu.com

检查pacemaker的启动状况:
~]# ps axf
…… ……
4777 ? Ss 0:00 /usr/sbin/pacemakerd -f
4778 ? Ss 0:00 _ /usr/libexec/pacemaker/cib
4779 ? Ss 0:00 _ /usr/libexec/pacemaker/stonithd
4780 ? Ss 0:00 _ /usr/libexec/pacemaker/lrmd
4781 ? Ss 0:00 _ /usr/libexec/pacemaker/attrd
4782 ? Ss 0:00 _ /usr/libexec/pacemaker/pengine
4783 ? Ss 0:00 _ /usr/libexec/pacemaker/crmd

最后查看pacemaker集群状态:
~]# pcs status
Cluster name: mycluster
WARNING: no stonith devices and stonith-enabled is not false
Last updated: Fri Oct 16 16:06:00 2015
Last change: Fri Oct 16 15:59:29 2015
Stack: corosync
Current DC: node2.magedu.com (2) - partition with quorum
Version: 1.1.12-a14efad
2 Nodes configured
0 Resources configured

Online: [ node1.magedu.com node2.magedu.com ]

Full list of resources:

PCSD Status:
node1.magedu.com: Online
node2.magedu.com: Online

Daemon Status:
corosync: active/disabled
pacemaker: active/disabled
pcsd: active/disabled

其中的WARNING信息是因为当前集群系统开启了stonith-enabled属性但却没有配置stonith设备所致。使用crm_verify命令也可检查出此错误。
~]# crm_verify -L -V
error: unpack_resources: Resource start-up disabled since no STONITH resources have been defined
error: unpack_resources: Either configure some or disable STONITH with the stonith-enabled option
error: unpack_resources: NOTE: Clusters with shared data need STONITH to ensure data integrity
Errors found during check: config not valid

可以使用如下命令禁用集群的stonith特性,而后再次检查将不再出现错误信息。
~]# pcs property set stonith-enabled=false
~]# crm_verify -L -V

3、pcs命令简介

pcs命令可以使用pacemaker集群的全生命周期管理,每一种管理功能均通过相应的子命令实现。
cluster:Configure cluster options and nodes
resource:Manage cluster resources
stonith:Configure fence devices
constraint:Set resource constraints
property:Set pacemaker properties
acl:Set pacemaker access control lists
status:View cluster status
config:View and manage cluster configuration

4、配置集群属性

corosync有许多全局配置属性,例如前面修改的stonith-enabled即为此类属性之一。pcs的property子命令可用于显示或设置集群的各属性。下面的命令可以获取其详细使用帮助。

~]# pcs property –help

其相关的管理命令有:
list|show [ | –all | –defaults]
set [–force] [–node ] =[]
unset [–node ]

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