greenplum 叢集新增 standby節點
阿新 • • 發佈：2018-11-16
greenplum 單獨新增 standby
本文主要介紹如何為沒有做Standby的Master節點新增Standby。（快速整理版）
舊版本gp叢集需要注意！！！！
在為Master節點搭建Standby的過程中，GreenPlum會自動關閉資料庫，並以utility模式開啟Master節點，然後修改gp_segment_configuration字典中增加Standby的資訊，然後再關閉Master節點，將Master的資料拷貝到Standby節點，最後啟動資料庫，所以，在為Master節點新增Standby時，需要在空閒時段進行，否則會影響業務。
新增新節點需要完成如下工作：
參考資訊： http://blog.51cto.com/michaelkang/2167195
1：新建gp 使用者，使用者id 與叢集節點保持一直；
2：新建資料目錄，chown gpadmin.gpadmin $DIR；
3：叢集所有主機(Master節點和所有Segment節點)的hosts檔案均需要新增Standby主機的資訊。
4：完成系統初始化（關閉防火牆，selinux ，sysctl.conf ,limits.conf ...），具體參考greenplum 叢集安裝初始化安裝步驟；
5：直接打通master節點 ssh 免密登陸新新增standby ；
6：standby節點 ssh 免密登陸叢集其它節點,通過gpssh工具測試；
7：安裝greenplum 軟體包
8：檢查新新增standby 節點安裝目錄許可權，chown gpadmin.gpadmin $DIR
9：設定standby 節點gpadmin賬戶的環境變數，使之生效；
以上確認配置沒問題後：
10.在Master節點通過gpinitstandby命令新增Standby。 （gpadmin 使用者執行）
[ 操作例項：
[[email protected] ~]$ gpinitstandby -s kangjianhua-6-15.ptmind.com gpadmin-[INFO]:-Validating environment and parameters for standby initialization... gpadmin-[INFO]:-Checking for filespace directory /usr/local/gpdata/gpmaster/gpseg-1 on kangjianhua-6-15.ptmind.com gpadmin-[INFO]:------------------------------------------------------ gpadmin-[INFO]:-Greenplum standby master initialization parameters gpadmin-[INFO]:------------------------------------------------------ gpadmin-[INFO]:-Greenplum master hostname = kangjianhua-6-16.ptmind.com gpadmin-[INFO]:-Greenplum master data directory = /usr/local/gpdata/gpmaster/gpseg-1 gpadmin-[INFO]:-Greenplum master port = 5432 gpadmin-[INFO]:-Greenplum standby master hostname = kangjianhua-6-15.ptmind.com gpadmin-[INFO]:-Greenplum standby master port = 5432 gpadmin-[INFO]:-Greenplum standby master data directory = /usr/local/gpdata/gpmaster/gpseg-1 gpadmin-[INFO]:-Greenplum update system catalog = On gpadmin-[INFO]:------------------------------------------------------ gpadmin-[INFO]:- Filespace locations gpadmin-[INFO]:------------------------------------------------------ gpadmin-[INFO]:-pg_system -> /usr/local/gpdata/gpmaster/gpseg-1 Do you want to continue with standby master initialization? Yy|Nn (default=N): > y gpadmin-[INFO]:-Syncing Greenplum Database extensions to standby gpadmin-[INFO]:-The packages on kangjianhua-6-15.ptmind.com are consistent. gpadmin-[INFO]:-Adding standby master to catalog... gpadmin-[INFO]:-Database catalog updated successfully. gpadmin-[INFO]:-Updating pg_hba.conf file... gpadmin-[INFO]:-pg_hba.conf files updated successfully. gpadmin-[INFO]:-Updating filespace flat files... gpadmin-[INFO]:-Filespace flat file updated successfully. gpadmin-[INFO]:-Starting standby master gpadmin-[INFO]:-Checking if standby master is running on host: kangjianhua-6-15.ptmind.com in directory: /usr/local/gpdata/gpmaster/gpseg-1 20181115:18:06:06:176421 gpinitstandby:kangjianhua-6-16:gpadmin-[WARNING]:-Unable to cleanup previously started standby: 20181115:18:06:07:176421 gpinitstandby:kangjianhua-6-16:gpadmin-[INFO]:-Cleaning up pg_hba.conf backup files... 20181115:18:06:08:176421 gpinitstandby:kangjianhua-6-16:gpadmin-[INFO]:-Backup files of pg_hba.conf cleaned up successfully. 20181115:18:06:08:176421 gpinitstandby:kangjianhua-6-16:gpadmin-[INFO]:-Successfully created standby master on kangjianhua-6-15.ptmind.com
gpcc 問題處理：
greenplum master 節點遷移後，gpcc節點的配置要需要修改gpcc 連線節點的指向新的master地址：
gp 叢集master切換後，需要修改：
/usr/local/gpcc/greenplum-cc-web-4.3.1/conf
cp app.conf app.conf.bak
vim app.conf
[[email protected] conf]$ more app.conf
appname = gpccws
listentcp4 = true
runmode = prod
session = true
enablexsrf = true
xsrfexpire = 2592000
xsrfkey = 61oETzKXQAGaYdkLxxxxxxxxxxxxxx
rendertype = json
printallsqls = false
master_port = 5432
path = /usr/local/gpcc
display_name = gpcc
enable_kerberos = false
EnableHTTPS = false
EnableHTTP = true
httpport = 28080
rpc_port = 8899
master_host = kangjianhua-6-15.ptmind.com ==> kangjianhua-6-16.ptmind.com (新master) 《《《===修改內容
檢視狀態：
gpcc status
啟動服務：
gpcc start
#檢視服務程序：
ps -ef|grep ccagent
/usr/local/gpcc/greenplum-cc-web-4.3.1/bin/ccagent -udpport 9898 -rpcaddr kangjianhua-6-15.ptmind.com:8899
安裝參考：
http://blog.51cto.com/michaelkang/2170631