目录
Openstack-Mitaka 高可用之 概述
Openstack-Mitaka 高可用之 环境初始化
Openstack-Mitaka 高可用之 Mariadb-Galera集群部署
Openstack-Mitaka 高可用之 memcache
Openstack-Mitaka 高可用之 Pacemaker+corosync+pcs高可用集群
Openstack-Mitaka 高可用之 认证服务（keystone）
Openstack-Mitaka 高可用之 计算服务（Nova）
Openstack-Mitaka 高可用之 网络服务（Neutron）
Openstack-Mitaka 高可用之 Dashboard
Openstack-Mitaka 高可用之 启动一个实例
Openstack-Mitaka 高可用之 测试
介绍及特点
Pacemaker：工作在资源分配层，提供资源管理器的功能
Corosync：提供集群的信息层功能，传递心跳信息和集群事务信息
Pacemaker + Corosync 就可以实现高可用集群架构
集群搭建
以下三个节点都需要执行：
# yum install pcs -y # systemctl start pcsd ; systemctl enable pcsd # echo ‘hacluster‘ | passwd --stdin hacluster # yum install haproxy rsyslog -y # echo ‘net.ipv4.ip_nonlocal_bind = 1‘ >> /etc/sysctl.conf # 启动服务的时候，允许忽视VIP的存在 # echo ‘net.ipv4.ip_forward = 1‘ >> /etc/sysctl.conf # 开启内核转发功能 # sysctl -p
在任意节点创建用于haproxy监控Mariadb的用户
MariaDB [(none)]> CREATE USER ‘haproxy‘@‘%‘ ;
配置haproxy用于负载均衡器
[root@controller1 ~]# egrep -v "^#|^$" /etc/haproxy/haproxy.cfg log 127.0.0.1 local2 chroot /var/lib/haproxy pidfile /var/run/haproxy.pid maxconn 4000 user haproxy group haproxy daemon # turn on stats unix socket stats socket /var/lib/haproxy/stats defaults mode http log global option httplog option dontlognull option http-server-close option forwardfor except 127.0.0.0/8 option redispatch retries 3 timeout http-request 10s timeout queue 1m timeout connect 10s timeout client 1m timeout server 1m timeout http-keep-alive 10s timeout check 10s maxconn 4000 listen galera_cluster mode tcp bind 192.168.0.10:3306 balance source option mysql-check user haproxy server controller1 192.168.0.11:3306 check inter 2000 rise 3 fall 3 backup server controller2 192.168.0.12:3306 check inter 2000 rise 3 fall 3 server controller3 192.168.0.13:3306 check inter 2000 rise 3 fall 3 backup listen memcache_cluster mode tcp bind 192.168.0.10:11211 balance source option tcplog server controller1 192.168.0.11:11211 check inter 2000 rise 3 fall 3 server controller2 192.168.0.12:11211 check inter 2000 rise 3 fall 3 server controller3 192.168.0.13:11211 check inter 2000 rise 3 fall 3
注意：
（1）确保haproxy配置无误，建议首先修改ip和端口启动测试是否成功。
（2）Mariadb-Galera和rabbitmq默认监听到 0.0.0.0 修改调整监听到本地 192.168.0.x
（3）将haproxy正确的配置拷贝到其他节点，无需手动启动haproxy服务
为haproxy配置日志（所有controller节点执行）：
# vim /etc/rsyslog.conf … $ModLoad imudp $UDPServerRun 514 … local2.* /var/log/haproxy/haproxy.log … # mkdir -pv /var/log/haproxy/ mkdir: created directory ‘/var/log/haproxy/’ # systemctl restart rsyslog
启动haproxy进行验证操作：
# systemctl start haproxy [root@controller1 ~]# netstat -ntplu | grep ha tcp 0 0 192.168.0.10:3306 0.0.0.0:* LISTEN 15467/haproxy tcp 0 0 192.168.0.10:11211 0.0.0.0:* LISTEN 15467/haproxy udp 0 0 0.0.0.0:43268 0.0.0.0:* 15466/haproxy 验证成功，关闭haproxy # systemctl stop haproxy
在controller1节点上执行：
[root@controller1 ~]# pcs cluster auth controller1 controller2 controller3 -u hacluster -p hacluster --force
controller3: Authorized
controller2: Authorized
controller1: Authorized
创建集群：
[root@controller1 ~]# pcs cluster setup --name openstack-cluster controller1 controller2 controller3 --force Destroying cluster on nodes: controller1, controller2, controller3... controller3: Stopping Cluster (pacemaker)... controller2: Stopping Cluster (pacemaker)... controller1: Stopping Cluster (pacemaker)... controller3: Successfully destroyed cluster controller1: Successfully destroyed cluster controller2: Successfully destroyed cluster Sending ‘pacemaker_remote authkey‘ to ‘controller1‘, ‘controller2‘, ‘controller3‘ controller3: successful distribution of the file ‘pacemaker_remote authkey‘ controller1: successful distribution of the file ‘pacemaker_remote authkey‘ controller2: successful distribution of the file ‘pacemaker_remote authkey‘ Sending cluster config files to the nodes... controller1: Succeeded controller2: Succeeded controller3: Succeeded Synchronizing pcsd certificates on nodes controller1, controller2, controller3... controller3: Success controller2: Success controller1: Success Restarting pcsd on the nodes in order to reload the certificates... controller3: Success controller2: Success controller1: Success
启动集群的所有节点：
[root@controller1 ~]# pcs cluster start --all controller2: Starting Cluster... controller1: Starting Cluster... controller3: Starting Cluster... [root@controller1 ~]# pcs cluster enable --all controller1: Cluster Enabled controller2: Cluster Enabled controller3: Cluster Enabled
查看集群信息：
[root@controller1 ~]# pcs status Cluster name: openstack-cluster WARNING: no stonith devices and stonith-enabled is not false Stack: corosync Current DC: controller3 (version 1.1.16-12.el7_4.4-94ff4df) - partition with quorum Last updated: Thu Nov 30 19:30:43 2017 Last change: Thu Nov 30 19:30:17 2017 by hacluster via crmd on controller3 3 nodes configured 0 resources configured Online: [ controller1 controller2 controller3 ] No resources Daemon Status: corosync: active/enabled pacemaker: active/enabled pcsd: active/enabled [root@controller1 ~]# pcs cluster status Cluster Status: Stack: corosync Current DC: controller3 (version 1.1.16-12.el7_4.4-94ff4df) - partition with quorum Last updated: Thu Nov 30 19:30:52 2017 Last change: Thu Nov 30 19:30:17 2017 by hacluster via crmd on controller3 3 nodes configured 0 resources configured PCSD Status: controller2: Online controller3: Online controller1: Online
三个节点都在线
默认的表决规则建议集群中的节点个数为奇数且不低于3。当集群只有2个节点，其中1个节点崩坏，由于不符合默认的表决规则，集群资源不发生转移，集群整体仍不可用。no-quorum-policy="ignore"可以解决此双节点的问题，但不要用于生产环境。换句话说，生产环境还是至少要3节点。
pe-warn-series-max、pe-input-series-max、pe-error-series-max代表日志深度。
cluster-recheck-interval是节点重新检查的频率。
[root@controller1 ~]# pcs property set pe-warn-series-max=1000 pe-input-series-max=1000 pe-error-series-max=1000 cluster-recheck-interval=5min
禁用stonith：
stonith是一种能够接受指令断电的物理设备，环境无此设备，如果不关闭该选项，执行pcs命令总是含其报错信息。
[root@controller1 ~]# pcs property set stonith-enabled=false
二个节点时，忽略节点quorum功能：
[root@controller1 ~]# pcs property set no-quorum-policy=ignore
验证集群配置信息
[root@controller1 ~]# crm_verify -L -V
为集群配置虚拟 ip
[root@controller1 ~]# pcs resource create ClusterIP ocf:heartbeat:IPaddr2 ip="192.168.0.10" cidr_netmask=32 nic=eno16777736 op monitor interval=30s
到此，Pacemaker+corosync 是为 haproxy服务的，添加haproxy资源到pacemaker集群
[root@controller1 ~]# pcs resource create lb-haproxy systemd:haproxy --clone
说明：创建克隆资源，克隆的资源会在全部节点启动。这里haproxy会在三个节点自动启动。
查看Pacemaker资源情况
[root@controller1 ~]# pcs resource ClusterIP (ocf::heartbeat:IPaddr2): Started controller1 # 心跳的资源绑定在第三个节点的 Clone Set: lb-haproxy-clone [lb-haproxy] # haproxy克隆资源 Started: [ controller1 controller2 controller3 ]
注意：这里一定要进行资源绑定，否则每个节点都会启动haproxy，造成访问混乱
将这两个资源绑定到同一个节点上
[root@controller1 ~]# pcs constraint colocation add lb-haproxy-clone ClusterIP INFINITY
绑定成功
[root@controller1 ~]# pcs resource ClusterIP (ocf::heartbeat:IPaddr2): Started controller3 Clone Set: lb-haproxy-clone [lb-haproxy] Started: [ controller1] Stopped: [ controller2 controller3 ]
配置资源的启动顺序，先启动vip，然后haproxy再启动，因为haproxy是监听到vip
[root@controller1 ~]# pcs constraint order ClusterIP then lb-haproxy-clone
手动指定资源到某个默认节点，因为两个资源绑定关系，移动一个资源，另一个资源自动转移。
[root@controller1 ~]# pcs constraint location ClusterIP prefers controller1 [root@controller1 ~]# pcs resource ClusterIP (ocf::heartbeat:IPaddr2): Started controller1 Clone Set: lb-haproxy-clone [lb-haproxy] Started: [ controller1 ] Stopped: [ controller2 controller3 ] [root@controller1 ~]# pcs resource defaults resource-stickiness=100 # 设置资源粘性，防止自动切回造成集群不稳定 现在vip已经绑定到controller1节点 [root@controller1 ~]# ip a | grep global inet 192.168.0.11/24 brd 192.168.0.255 scope global eno16777736 inet 192.168.0.10/32 brd 192.168.0.255 scope global eno16777736 inet 192.168.118.11/24 brd 192.168.118.255 scope global eno33554992
尝试通过vip连接数据库
Controller1:
[root@controller1 haproxy]# mysql -ugalera -pgalera -h 192.168.0.10
Controller2:
高可用配置成功。
测试高可用是否正常
在controller1节点上直接执行 poweroff -f
[root@controller1 ~]# poweroff -f
vip很快就转移到controller2节点上
再次尝试访问数据库
无任何问题，测试成功。
查看集群信息：
[root@controller2 ~]# pcs status Cluster name: openstack-cluster Stack: corosync Current DC: controller3 (version 1.1.16-12.el7_4.4-94ff4df) - partition with quorum Last updated: Thu Nov 30 23:57:28 2017 Last change: Thu Nov 30 23:54:11 2017 by root via crm_attribute on controller1 3 nodes configured 4 resources configured Online: [ controller2 controller3 ] OFFLINE: [ controller1 ] # controller1 已经下线 Full list of resources: ClusterIP (ocf::heartbeat:IPaddr2): Started controller2 Clone Set: lb-haproxy-clone [lb-haproxy] Started: [ controller2 ] Stopped: [ controller1 controller3 ] Daemon Status: corosync: active/enabled pacemaker: active/enabled pcsd: active/enabled
