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corosync / pacemaker를 이용한 HA구성

  1. HA stack

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    1. Hardware : 물리서버
    2. Message : Clustering 맴버간 통신상태 확인
    3. Resoure Manager : failover / failback 작업 수행
    4. Management : HA를 구성하도록 제공되는 Tool
    5. Service : HA용 서비스
  2. Service Architecture (Active  / Standby)


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설치 방안 (모든 노드)

1.패키지 설치

$> yum install corosync pacemaker pcs automake -y

1.HA를 위한 사용자 계정설정 후 pcsd 서비스 실행 (모든노드 동일한 패스워드 입력)

$> passwd hacluster
Changing password for user hacluster.
New password:
BAD PASSWORD: it is based on a dictionary word
Retype new password:
passwd: all authentication tokens updated successfully.
$> systemctl start pcsd

  1. 클러스터 인증구성 (이후 과정은 master or slave 중 1대에서만 수행)
    $> pcs cluster auth master slave
    Username: hacluster
    Password:
    master: Authorized
    slave: Authorized
  2. 클러스터 구성
    $> pcs cluster setup --name cluster master slave
    Destroying cluster on nodes: master, slave...
    master: Stopping Cluster (pacemaker)...
    slave: Stopping Cluster (pacemaker)...
    slave: Successfully destroyed cluster
    master: Successfully destroyed cluster
    
    Sending 'pacemaker_remote authkey' to 'master', 'slave'
    slave: successful distribution of the file 'pacemaker_remote authkey'
    master: successful distribution of the file 'pacemaker_remote authkey'
    Sending cluster config files to the nodes...
    master: Succeeded
    slave: Succeeded
    
    Synchronizing pcsd certificates on nodes master, slave...
    master: Success
    slave: Success
    Restarting pcsd on the nodes in order to reload the certificates...
    master: Success
    slave: Success
  3. 클러스터 에 필요한 서비스 구동
    $> pcs cluster start --all
    # pcs status corosync
    
    Membership information
    ----------------------
        Nodeid      Votes Name
            1          1 master (local)
            2          1 slave
    
    
    #pcs property set stonith-enabled=false
  4. 재부팅 후 서비스 활성화 (양쪽서버에서 모두 수행)
    # systemctl enable pacemaker
    # systemctl enable corosync

관리툴(crmsh) 설치

  1. crmsh설치를 위한 OS 패키지 설치
    $> yum install -y python-lxml  pacemaker-libs-devel asciidoc python-dateutil python-yaml --skip-broken
    $> yum install python-devel python-setuptools -y
  2. crmsh 패키지 다운로드 후 설치
    $> ./autogen.sh
    autoconf:       autoconf (GNU Autoconf) 2.63
    automake:       automake (GNU automake) 1.11.1
    aclocal
    automake --add-missing --include-deps --copy
    configure.ac:33: installing `./install-sh'
    configure.ac:33: installing `./missing'
    autoconf
    Now run ./configure
    
    ># ./configure
    checking for a BSD-compatible install... /usr/bin/install -c
    checking whether build environment is sane... yes
    checking for a thread-safe mkdir -p... /bin/mkdir -p
    checking for gawk... gawk
    checking whether make sets $(MAKE)... yes
    checking for python... /usr/bin/python
    checking for python version... 2.6
    checking for python platform... linux2
    checking for python script directory... ${prefix}/lib/python2.6/site-packages
    checking for python extension module directory... ${exec_prefix}/lib64/python2.6/site-packages
    checking for asciidoc... no
    configure: creating ./config.status
    config.status: creating Makefile
    config.status: creating hb_report/hb_report
    config.status: creating crm.conf
    config.status: creating version
    ># make; make install
    ...
  3. CRM 라이브러리 연동
    # ln -s /usr/local/lib/python2.6/site-packages/crmsh   /usr/lib/python2.6/site-packages/
  4. 서비스 구동
    # /etc/init.d/corosync start
    ># /etc/init.d/pacemaker start
    ># chkconfig corosync on
    ># chkconfig pacemaker on
    • 주의사항 : Pacemaker/Corosync를 이용한 HA시 corosync에서 메시지를 처리하기 때문에 pacemaker보다 corosync가 먼저 실행되어야 한다.
    • 서비스 중지는 pacemaker → corosync 순으로 종료
  5. 서비스 이상여부 확인
    $> crm_mon -1
  6. HA 리소스 구성
    ########## 동일한 가중치 설정으로 Auto-Failback 비활성화 #############
    >#crm configure
    crm(configure)# property stonith-enabled=false
    crm(configure)# property no-quorum-policy=ignore
    crm(configure)# rsc_defaults resource-stickiness=100
    crm(configure)# commit
    
    
    ############## HA용 VIP 설정 #####################
    crm(configure)# primitive TEST_STOR_VIP ocf:heartbeat:IPaddr2 params ip={HA VIP} cidr_netmask=24 op monitor interval=10s
    
    ############## DRBD 연동 #########################
    crm(configure)# primitive TEST_STOR_DRBD ocf:linbit:drbd params drbd_resource="drbd0" op monitor interval="20s" role="Master" op monitor interval="20s" role="Slave"
    crm(configure)# ms MS_TEST_STOR_DRBD TEST_STOR_DRBD meta master-max="1" master-node-max="1" clone-max="2" clone-node-max="1" notify="true"
    crm(configure)# primitive TEST_STOR_FS ocf:heartbeat:Filesystem params device="/dev/drbd0" directory="/data" fstype="xfs"
    
    
    
    
    ############ DRBD 그룹구성, 서비스 구동 순서 설정 #################3
    crm(configure)# group TEST_STOR_GP TEST_STOR_FS TEST_STOR_VIP meta migration-threshold="5"
    crm(configure)# colocation DRBD_on_HA inf: TEST_STOR_GP MS_TEST_STOR_DRBD:Master
    crm(configure)# order DRBD_after_HA inf: MS_TEST_STOR_DRBD:promote TEST_STOR_GP:start
    
    
    
    
    ############## 리소스 구성후 완료 ######################
    crm(configure)# commit
  7. HA구성정보 확인
    # crm_mon -1
    Stack: classic openais (with plugin)
    Current DC: TEST-STOR#1 (version 1.1.18-3.el6-bfe4e80420) - partition with quorum
    Last updated: Wed Dec 18 18:29:46 2019
    Last change: Mon Sep  2 19:26:34 2019 by root via crm_resource on TEST-STOR#1
    
    2 nodes configured (2 expected votes)
    5 resources configured
    
    Online: [ TEST-STOR#1 TEST-STOR#2 ]
    
    Active resources:
    
     Master/Slave Set: MS_TEST_STOR_DRBD [TEST_STOR_DRBD]
         Masters: [ TEST-STOR#1 ]
         Slaves: [ TEST-STOR#2 ]
     Resource Group: TEST_STOR_GP
         TEST_STOR_FS        (ocf::heartbeat:Filesystem):    Started TEST-STOR#1
         TEST_STOR_APACHE    (lsb:httpd):    tarted TEST-STOR#1
         TEST_STOR_VIP       (ocf::heartbeat:IPaddr):        Started TEST-STOR#1