Pcs安装
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一、操作系统基础环境配置
1.1 配置本地 yum 仓库(每个节点都需要执行)
[root@pacemaker-node1 ~]# mount /mnt/rhel-server-7.4-x86_64-dvd.iso /mnt/yum
[root@pacemaker-node1 ~]# cat /etc/yum.repos.d/yum.repo
[base]
name=base
enabled=1
gpgcheck=0
baseurl=file:///mnt/yum
[HA]
name=HA
enabled=1
gpgcheck=0
baseurl=file:///mnt/yum/addons/HighAvailability
[root@pacemaker-node1 ~]# yum repolist
Loaded plugins: langpacks
repo id repo name status
HA HA 35
base base 4,986
repolist: 5,021
1.2 配置主机间解析(每个节点都需要执行)
[root@pacemaker-node1 ~]# cat /etc/hosts
192.168.0.100 pacemaker-node1
192.168.0.101 pacemaker-node2
1.3 配置节点间互信(每个节点都需执行)
# ssh-keygen -t dsa -f ~/.ssh/id_dsa -N ""
# ssh-copy-id node1
# ssh-copy-id node2
二、安装并配置 drbd 环境
2.1 准备磁盘及 drbd 软件(每个节点都需具备物理环境)
[root@pacemaker-node1 ~]# lsblk
[root@pacemaker-node1 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 136.8G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 118G 0 part
│ ├─rhel-root 253:0 0 50G 0 lvm /
│ ├─rhel-swap 253:1 0 8G 0 lvm [SWAP]
│ └─rhel-home 253:2 0 60G 0 lvm /home
└─sda3 8:3 0 5G 0 part
└─drbd0 147:0 0 5G 0 disk
2.2 安装并配置 drbd 基础环境(每个节点都需执行)
[root@pacemaker-node1 ~]# ls /opt/
drbd84-utils-8.9.1-1.el7.elrepo.x86_64.rpm kmod-drbd84-8.4.10-1_2.el7_4.elrepo.x86_64.rpm
[root@pacemaker-node1 ~]# rpm -ivh /opt/drbd84-utils-8.9.1-1.el7.elrepo.x86_64.rpm /opt/kmod-drbd84-8.4.10-1_2.el7_4.elrepo.x86_64.rpm
[root@pacemaker-node1 ~]# cp /etc/drbd.d/global_common.conf /etc/drbd.d/global_common.conf.bak
[root@pacemaker-node1 ~]# vi /etc/drbd.d/global_common.conf
[root@pacemaker-node1 ~]# cat /etc/drbd.d/global_common.conf
global
usage-count yes;
common
protocol C;
resource mysql
on pacemaker-node1
device /dev/drbd0;
disk /dev/sda3;
address 192.168.0.100:7789;
meta-disk internal;
on pacemaker-node2
device /dev/drbd0;
disk /dev/sda3;
address 192.168.0.101:7789;
meta-disk internal;
2.3 格式化 drbd 磁盘,并启动服务(每个节点都需执行)
[root@pacemaker-node1 ~]# dd if=/dev/zero bs=1M count=1 of=/dev/sdb; sync (此举仅是为了避免磁盘不干净而导致报错)
[root@pacemaker-node1 ~]# drbdadm create-md mysql
[root@pacemaker-node1 ~]# systemctl enable drbd;systemctl start drbd
2.4 在某一节点确认 drbd 的正确状态
[root@pacemaker-node1 ~]# cat /proc/drbd
version: 8.4.10-1 (api:1/proto:86-101)
GIT-hash: a4d5de01fffd7e4cde48a080e2c686f9e8cebf4c build by mockbuild@, 2017-09-15 14:23:22
0: cs:Connected ro:Secondary/Secondary ds:Inconsistent/Inconsistent C r-----
ns:0 nr:0 dw:0 dr:0 al:8 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:20970844
2.5 设置 node1 节点为主节点,后台进程会开始进行数据同步,需要等待数据同步完成
[root@pacemaker-node1 ~]# drbdsetup /dev/drbd0 primary --o (设置本机为主节点)
[root@pacemaker-node1 ~]# drbd-overview
0:mysql/0 SyncSource Primary/Secondary UpToDate/Inconsistent
[>....................] synced: 2.4% (19996/20476)M
[root@pacemaker-node1 ~]# drbd-overview (数据同步完成)
0:mysql/0 Connected Primary/Secondary UpToDate/UpToDate
2.6 在 drbd 的主节点格式化磁盘文件系统,并进行挂载测试
[root@pacemaker-node1 ~]# mkfs.xfs /dev/drbd0
[root@pacemaker-node1 ~]# mkdir /mysql (两个节点都需要执行)
[root@pacemaker-node1 ~]# mount /dev/drbd0 /mysql/
三、安装并配置 Mariadb 数据库
3.1 安装并配置 mariadb 数据库(两个节点都需要执行)
[root@pacemaker-node1 ~]# yum install mariadb mariadb-server MySQL-python -y
3.2 更改 mariadb 数据库默认目录为drbd 磁盘对应的/mysql目录(两个节点都需要执行)
[root@pacemaker-node1 ~]# vi /etc/my.cnf
[root@pacemaker-node1 ~]# grep -vE "^#|^$" /etc/my.cnf
[mysqld]
datadir=/mysql
socket=/var/lib/mysql/mysql.sock
symbolic-links=0
[mysqld_safe]
log-error=/var/log/mariadb/mariadb.log
pid-file=/var/run/mariadb/mariadb.pid
!includedir /etc/my.cnf.d
[root@pacemaker-node1 ~]# chown -R mysql.mysql /mysql/ (两个节点都需要执行目录权限的设定)
[root@pacemaker-node1 ~]# systemctl disable mariadb ; systemctl status mariadb (两个节点确定 mariadb 不开机启动)
四、安装 pacemaker 集群软件
4.1 安装 pacemaker 集群软件,并创建集群 (每个节点都需执行)
[root@pacemaker-node1 ~]# yum install pcs pacemaker fence-agents-all -y
设置集群用户密码(每个节点都需执行且密码相同)
[root@pacemaker-node1 ~]# passwd hacluster (例如redhat)
启动pcsd服务(每个节点都需执行)
[root@pacemaker-node1 ~]# systemctl start pcsd ;systemctl enable pcsd
认证 pcs(在一个节点执行操作)
[root@pacemaker-node1 ~]# pcs cluster auth pacemaker-node1 pacemaker-node2 -u hacluster -p redhat --force
创建集群,并启动(在一个节点执行操作)
[root@pacemaker-node1 ~]# pcs cluster setup --force --name pmcluster pacemaker-node1 pacemaker-node2 # 客户环境中需要将 MY_pacemaker 替换成要创建的集群名
[root@pacemaker-node1 ~]# pcs cluster start --all
[root@pacemaker-node1 ~]# pcs cluster enable --all
查看集群各种状态,检查节点加入集群的状态
[root@node1 ~]# pcs status
Cluster name: pmcluster
Stack: corosync
Current DC: node2 (version 1.1.16-12.el7-94ff4df) - partition with quorum
Last updated: Wed Mar 21 05:03:22 2018
Last change: Wed Mar 21 02:00:54 2018 by root via cibadmin on node1
2 nodes configured
0 resources configured
Online: [ pacemaker-node1 pacemaker-node2 ]
No resources
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: active/enabled
[root@node1 ~]# 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(192.168.0.100)
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(192.168.0.101)
runtime.totem.pg.mrp.srp.members.2.join_count (u32) = 1
runtime.totem.pg.mrp.srp.members.2.status (str) = joined
[root@node1 ~]# pcs status corosync
Membership information
----------------------
Nodeid Votes Name
1 1 node1 (local)
2 1 node2
[root@node1 ~]# ps -axf |grep pacemaker
9487 pts/0 S+ 0:00 /_ grep --color=auto pacemaker
1178 ? Ss 0:00 /usr/sbin/pacemakerd -f
1234 ? Ss 0:00 /_ /usr/libexec/pacemaker/cib
1235 ? Ss 0:00 /_ /usr/libexec/pacemaker/stonithd
1236 ? Ss 0:00 /_ /usr/libexec/pacemaker/lrmd
1238 ? Ss 0:00 /_ /usr/libexec/pacemaker/attrd
1241 ? Ss 0:00 /_ /usr/libexec/pacemaker/pengine
1243 ? Ss 0:00 /_ /usr/libexec/pacemaker/crmd
4.2 Pacemaker 集群常用参数的设置(@@@@@是否最后设置呢?)
[root@node1 ~]# pcs resource defaults resource-stickiness=100 (设置资源不回切,防止资源切来切去)
[root@node1 ~]# pcs resource defaults migration-threshold=1 (节点失效就迁移资源)
[root@node1 ~]# pcs resource defaults
migration-threshold: 1
resource-stickiness: 100
[root@node1 ~]# pcs property set no-quorum-policy=ignore (忽略仲裁策略)
[root@node1 ~]# pcs property set stonith-enabled=false (此处为禁用 fence 的方法,如果需要配置 fence 上面已经列出了配置方法)
[root@node1 ~]# pcs property
Cluster Properties:
cluster-infrastructure: corosync ----------------------->(rhel 7 集群使用corosync)
cluster-name: MY_pacemaker
dc-version: 1.1.16-12.el7-94ff4df
have-watchdog: false
no-quorum-policy: ignore
stonith-enabled: false
[root@node1 ~]# pcs resource op defaults timeout=30s (设置资源超时时间)
[root@node1 ~]# pcs resource op defaults
timeout: 30s
[root@node1 ~]# crm_verify --live-check (检查当前配置是否有错)
五、配置 pacemaker 资源
@@@@@@@@@追加的内容,添加fence 资源
fence 暂时没有配置(此处仅列出了配置方法)
[root@node1 ~]# pcs property set stonith-enabled=true (此处为禁用 fence 的方法,如果需要配置 fence 上面已经列出了配置方法)
100 fence地址:211
101 fence地址:210
[root@pacemaker-node1 ~]# pcs stonith create node1_fence fence_ipmilan ipaddr="192.168.0.211" passwd="redhat" login="root" action="reboot" pcmk_host_list=pacemaker-node1
[root@pacemaker-node1 ~]# pcs stonith create node2_fence fence_ipmilan ipaddr="192.168.0.210" passwd="redhat" login="root" action="reboot" pcmk_host_list=pacemaker-node2
补充:虚拟 fence 的配置方法
pcs stonith create pace1_fence fence_virt pcmk_host_list=rhcs_pacemaker_1
5.1 配置浮动 IP 资源
[root@node1 ~]# pcs resource create vip ocf:heartbeat:IPaddr2 /
ip=192.168.0.223 cidr_netmask=24 op monitor interval=30s
5.2 配置 drbd 资源
创建 drbd 配置文件 drbd_cfg
[root@node1 ~]# pcs cluster cib drbd_cfg
在配置文件中创建 drbd 资源
```shell
[root@node1 ~]# pcs -f drbd_cfg resource create DRBD /
ocf:linbit:drbd drbd_resource=mysql op monitor interval=60s
在配置文件中创建 clone 资源
[root@node1 ~]# pcs -f drbd_cfg resource master DRBDClone DRBD /
master-max=1 master-node-max=1 clone-max=2 clone-node-max=1 /
notify=true
查看 drbd_cfg 文件中定义的 drbd 资源
[root@node1 ~]# pcs -f drbd_cfg resource show
vip (ocf::heartbeat:IPaddr2): Started node1
Master/Slave Set: DRBDClone [DRBD]
Stopped: [ node1 node2 ]
推送 drbd_cfg 文件配置到集群中,并验证集群状态
[root@node1 ~]# pcs cluster cib-push drbd_cfg
[root@node1 ~]# pcs status
Cluster name: MY_pacemaker
Stack: corosync
Current DC: node1 (version 1.1.16-12.el7-94ff4df) - partition with quorum
Last updated: Wed Mar 21 06:19:12 2018
Last change: Wed Mar 21 06:18:47 2018 by root via cibadmin on node1
2 nodes configured
3 resources configured
Online: [ node1 node2 ]
Full list of resources:
vip (ocf::heartbeat:IPaddr2): Started node1
Master/Slave Set: DRBDClone [DRBD]
Masters: [ node1 ]
Slaves: [ node2 ]
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: active/enabled
确保 drbd 模块载入(两个节点都需要配置)
[root@node1 ~]# echo drbd > /etc/modules-load.d/drbd.conf
六、配置文件系统高可用
6.1 创建文件系统资源配置文件 fs_cfg
```shell
[root@node1 ~]# pcs cluster cib fs_cfg
6.2 在配置文件中创建数据库的文件系统资源
[root@node1 ~]# pcs -f fs_cfg resource create dbFS /
ocf:heartbeat:Filesystem device=/dev/drbd0 /
directory=/mysql fstype=xfs
6.3 在配置文件中将 DRBDClone 与数据库文件系统联系起来
[root@node1 ~]# pcs -f fs_cfg constraint colocation add /
dbFS with DRBDClone INFINITY with-rsc-role=Master
6.4 在配置文件中设置 DRBDClone 资源优先于文件系统
[root@node1 ~]# pcs -f fs_cfg constraint order promote /
DRBDClone then start dbFS
6.5 推送 fs_cfg 文件系统资源到集群中,查看资源状态
[root@node1 ~]# pcs cluster cib-push fs_cfg
CIB updated
[root@node1 ~]# pcs status
Cluster name: MY_pacemaker
Stack: corosync
Current DC: node2 (version 1.1.16-12.el7-94ff4df) - partition with quorum
Last updated: Wed Mar 21 06:31:57 2018
Last change: Wed Mar 21 06:31:52 2018 by root via cibadmin on node1
2 nodes configured
4 resources configured
Online: [ node1 node2 ]
Full list of resources:
vip (ocf::heartbeat:IPaddr2): Started node1
Master/Slave Set: DRBDClone [DRBD]
Masters: [ node1 ]
Slaves: [ node2 ]
dbFS (ocf::heartbeat:Filesystem): Started node1
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: active/enabled
6.6 创建 Mysql 服务的资源
[root@node1 ~]# pcs resource create Mysql systemd:mariadb op /
start timeout=180s op stop timeout=180s op monitor interval=20s /
timeout=60s
6.7 将所有资源添加到资源组中,以此保证整个资源组启动到单一节点,并验证集群中资源状态正常启动
[root@node1 ~]# pcs resource group add Mysql_service vip dbFS Mysql (添加到自定义资源组Mysql_service内,先后顺序代表了资源的启动顺序)
[root@node1 ~]# pcs status
Cluster name: MY_pacemaker
Stack: corosync
Current DC: node1 (version 1.1.16-12.el7-94ff4df) - partition with quorum
Last updated: Wed Mar 21 08:35:44 2018
Last change: Wed Mar 21 08:35:40 2018 by root via cibadmin on node1
2 nodes configured
5 resources configured
Online: [ node1 node2 ]
Full list of resources:
Master/Slave Set: DRBDClone [DRBD]
Masters: [ node1 ]
Slaves: [ node2 ]
Resource Group: Mysql_service
vip (ocf::heartbeat:IPaddr2): Started node1
dbFS (ocf::heartbeat:Filesystem): Started node1
Mysql (systemd:mariadb): Started node1
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: active/enabled
6.8 验证资源组切换正常
6.8.1 手工在数据库中创建测试数据库
[root@node1 ~]# mysql -uroot
MariaDB [(none)]> create database helloworld; (手工创建测试用的数据库,最后进行验证数据一致性)
6.8.2 手动使 node1 节点下线,验证资源组切换到备节点,验证数据一致性
[root@node1 ~]# pcs cluster standby node1 (该命令会临时下线 node1,且包括下线 drbd 的主状态)
[root@node1 ~]# pcs status
Cluster name: MY_pacemaker
Stack: corosync
Current DC: node1 (version 1.1.16-12.el7-94ff4df) - partition with quorum
Last updated: Wed Mar 21 14:02:59 2018
Last change: Wed Mar 21 14:02:40 2018 by root via cibadmin on node1
2 nodes configured
5 resources configured
Node node1: standby
Online: [ node2 ]
Full list of resources:
Master/Slave Set: DRBDClone [DRBD]
Masters: [ node2 ]
Stopped: [ node1 ]
Resource Group: Mysql_service -----------------> 整个资源组中的资源都成功的切换到了 node2 节点
vip (ocf::heartbeat:IPaddr2): Started node2
dbFS (ocf::heartbeat:Filesystem): Started node2
Mysql (systemd:mariadb): Started node2
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: active/enabled
[root@node1 ~]# drbd-overview (可以看到 drbd 的主状态已经下线)
0:mysql/0 Unconfigured . .
[root@node2 ~]# drbd-overview (可以看到 drbd 的主状态已经切换到 node2 节点)
0:mysql/0 WFConnection Primary/Unknown UpToDate/DUnknown /mysql xfs 20G 62M 20G 1%
[root@node2 ~]# mysql -uroot
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| helloworld | --------------> 此处验证了数据的一致性
| mysql |
| performance_schema |
| test |
+--------------------+
MariaDB [(none)]> create database mytestbase; --------------->(创建第二个测试数据库,再次切换集群进行验证)
6.8.3 手动使 node1 节点上线,验证集群状态
[root@node1 ~]# pcs cluster unstandby node1
[root@node1 ~]# pcs status
Cluster name: MY_pacemaker
Stack: corosync
Current DC: node1 (version 1.1.16-12.el7-94ff4df) - partition with quorum
Last updated: Wed Mar 21 14:08:47 2018
Last change: Wed Mar 21 14:08:44 2018 by root via cibadmin on node1
2 nodes configured
5 resources configured
Online: [ node1 node2 ]
Full list of resources:
Master/Slave Set: DRBDClone [DRBD]
Masters: [ node2 ]
Slaves: [ node1 ]
Resource Group: Mysql_service
vip (ocf::heartbeat:IPaddr2): Started node2
dbFS (ocf::heartbeat:Filesystem): Started node2
Mysql (systemd:mariadb): Started node2
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: active/enabled
6.8.4 手动使 node2 节点下线,验证业务切换到 node1 节点,并验证 drbd 状态及数据一致性
[root@node2 ~]# pcs cluster standby node2
[root@node2 ~]# pcs status
Cluster name: MY_pacemaker
Stack: corosync
Current DC: node1 (version 1.1.16-12.el7-94ff4df) - partition with quorum
Last updated: Wed Mar 21 14:12:46 2018
Last change: Wed Mar 21 14:12:29 2018 by root via cibadmin on node2
2 nodes configured
5 resources configured
Node node2: standby
Online: [ node1 ]
Full list of resources:
Master/Slave Set: DRBDClone [DRBD]
Masters: [ node1 ]
Stopped: [ node2 ]
Resource Group: Mysql_service
vip (ocf::heartbeat:IPaddr2): Started node1
dbFS (ocf::heartbeat:Filesystem): Started node1
Mysql (systemd:mariadb): Started node1
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: active/enabled
[root@node1 ~]# drbd-overview
0:mysql/0 WFConnection Primary/Unknown UpToDate/DUnknown /mysql xfs 20G 62M 20G 1%
[root@node1 ~]# mysql -uroot
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| helloworld |
| mysql |
| mytestbase | -----------------------> (此处为第二次切换前,创建的数据库,数据一致)
| performance_schema |
| test |
+--------------------+
6 rows in set (0.13 sec)
6.8.5 切换测试完成,最后确保集群内节点均处于在线状态
[root@node2 ~]# pcs cluster unstandby node2
[root@node2 ~]# pcs status
Cluster name: MY_pacemaker
Stack: corosync
Current DC: node1 (version 1.1.16-12.el7-94ff4df) - partition with quorum
Last updated: Wed Mar 21 14:16:43 2018
Last change: Wed Mar 21 14:16:39 2018 by root via cibadmin on node2
2 nodes configured
5 resources configured
Online: [ node1 node2 ]
Full list of resources:
Master/Slave Set: DRBDClone [DRBD]
Masters: [ node1 ]
Slaves: [ node2 ]
Resource Group: Mysql_service
vip (ocf::heartbeat:IPaddr2): Started node1
dbFS (ocf::heartbeat:Filesystem): Started node1
Mysql (systemd:mariadb): Started node1
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: active/enabled
============================================================
补充 DRBD 脑裂的修复:
1、为防止在恢复过程中造成数据丢失,建议先对数据进行备份。
2、两个节点都停止集群服务
# pcs cluster stop (另外一节点一般需要执行 pcs cluster stop --force)
3、在两个节点分别手动启动DRBD服务
# systemctl restart drbd
4、在主节点执行命令,强制提升为DRBD主节点
# drbdadm primary all
5、在备节点执行命令,强制降为DRBD备节点
# drbdadm secondary all
6、在备节点上执行数据同步此操作
# drbdadm --discard-my-data connect all
7、在主节点上执行连接操作
# drbdadm connect all
8、在两个节点上启动集群
# pcs cluster start
==========================================================
补充2: 双机应急方案
当双机状态出现异常时,需要手动重启双机,以便恢复到正常状态。
1、分别在两个节点重启双机
# pcs cluster stop
# pcs cluster start
2、重启服务器后,再启动双机服务
如果出现只重启双机服务后,部分服务不能正常恢复,建议重启服务器后,在启动双机服务:
# reboot
# pcs cluster start
=======================================================
总结:
1、为什么 fence 不自动迁移 ?
2、
切换整个资源组到其他节点(架构定义drbd clone和资源组一起切换)
[root@pacemaker-node1 ~]# crm_resource --resource Mysql_service --move --node pacemaker-node1 ; crm_resource --resource DRBDClone --move --node pacemaker-node1
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