2022-10-18-openGauss 3.0一主两备安装 · Pull Request !712 · openGauss/blog

+++ 
title = "openGauss 3.0一主两备安装" 
date ="2022-10-18" 
tags =["openGauss安装"] 
archives ="2022-10" 
author ="wuku" 
summary ="openGauss 3.0一主两备安装" 
times ="16:50"
+++
前期规划：

环境：麒麟V10系统 + openGauss 3.0

IP	主机名
主	192.168.6.201	ccf10
备1	192.168.6.202	ccf11
备2	192.168.6.203	ccf12

目录名称       所属用户	目录路径	权限      
数据库软件目录 omm /opt/openGauss 755 
数据库数据目录 omm /data/openGauss 700
数据库备份目录 omm /data/backup 700
数据库归档目录 omm /data/archive_wals 700
数据库core_dump目录 omm /data/core_pattern 700

1.查看系统环境

[root@ccf10 ~]# lscpu
架构： x86_64
...
型号名称： Intel(R) Core(TM) i7-4810MQ CPU @ 2.80GHz

[root@ccf10 ~]#
[root@ccf10 ~]# cat /etc/os-release
NAME="Kylin Linux Advanced Server"
VERSION="V10 (Sword)"
ID="kylin"
VERSION_ID="V10"
PRETTY_NAME="Kylin Linux Advanced Server V10 (Sword)"
ANSI_COLOR="0;31"
2.安装前环境配置
2.1主机名和hosts配置

[root@ccf10 ~]# hostnamectl set-hostname ccf10
--hostnamectl set-hostname ccf11
--hostnamectl set-hostname ccf12

cat >> /etc/hosts <<EOF
192.168.6.201 ccf10
192.168.6.202 ccf11
192.168.6.203 ccf12
EOF
2.2关闭防火墙

[root@ccf10 ~]# systemctl status firewalld.service
[root@ccf10 ~]# systemctl stop firewalld.service
[root@ccf10 ~]# systemctl disable firewalld.service
2.3selinux设置

[root@ccf10 ~]#sed -i 's/SELINUX\=enforcing/SELINUX\=disabled/g' /etc/selinux/config
2.4关闭透明大页transparent_hugepage

[root@ccf10 ~]# sed -i 's/quiet/quiet transparent_hugepage=never numa=off/' /etc/default/grub
[root@ccf10 ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
[root@ccf10 ~]# reboot
[root@ccf10 ~]# cat /sys/kernel/mm/transparent_hugepage/enabled
[root@ccf10 ~]# grep -i huge /proc/meminfo
2.5IPC参数设置

[root@ccf10 ~]# echo "RemoveIPC=no">> /etc/systemd/logind.conf
[root@ccf10 ~]# echo "RemoveIPC=no">> /usr/lib/systemd/system/systemd-logind.service
[root@ccf10 ~]# systemctl daemon-reload
[root@ccf10 ~]# systemctl stop systemd-logind
[root@ccf10 ~]# systemctl start systemd-logind
2.6内核参数调整/etc/sysctl.conf添加以下内容

[root@ccf10 ~]# cat >> /etc/sysctl.conf <<EOF

net.ipv4.tcp_max_tw_buckets=10000

net.ipv4.tcp_tw_reuse = 1

net.ipv4.tcp_tw_recycle = 1

net.ipv4.tcp_keepalive_probes=9

net.ipv4.tcp_keepalive_intvl=30

net.ipv4.tcp_retries1 = 5 #默认为3

net.ipv4.tcp_syn_retries = 5 #默认为6

net.ipv4.tcp_synack_retries = 5

net.ipv4.tcp_retries2 = 12 #默认为15

net.ipv4.tcp_rmem = 8192 250000 16777216

vm.overcommit_memory = 0

net.ipv4.tcp_wmem = 8192 250000 16777216

net.core.wmem_max = 21299200

net.core.rmem_max = 21299200

net.core.wmem_default = 21299200

net.core.rmem_default = 21299200

net.ipv4.tcp_syncookies = 1

net.ipv4.tcp_sack = 1

net.ipv4.tcp_timestamps = 1

fs.aio-max-nr=1048576

fs.file-max= 76724600

kernel.sem = 4096 2147483647 2147483646 512000

kernel.shmall = 1048576 # page, 80% MEM

kernel.shmmax = 4294967296 # bytes, 80% MEM

kernel.shmmni = 819200

net.core.netdev_max_backlog = 65535

net.core.somaxconn = 65535

net.ipv4.tcp_fin_timeout = 60

vm.swappiness = 0

net.ipv4.ip_local_port_range = 26000 65535

fs.nr_open = 20480000

EOF
2.7时区配置，如果不是CST建议调整

[root@ccf10 ~]# cat /etc/localtime

如果不是CST建议调整：
timedatectl set-timezone 'Asia/Shanghai'
date
hwclock -r
2.8创建用户与目录

groupadd -g 1000 dbgrp
useradd -u 1000 omm -g dbgrp
echo "Omm@1000"|passwd omm --stdin

mkdir -p /data/{openGauss,backup,archive_wals,core_pattern}
chmod 700 /data/{openGauss,backup,archive_wals,core_pattern}
chown -R omm:dbgrp /data/{openGauss,backup,archive_wals,core_pattern}
mkdir -p /opt/openGauss
chown omm:dbgrp -R /opt/openGauss/
chmod 755 -R /opt/openGauss/
2.9修改资源限制/etc/security/limits.conf添加以下内容

[root@ccf10 ~]# cat >> /etc/security/limits.conf <<EOF

omm soft nproc unlimited

omm hard nproc unlimited

omm soft nofile 1000000

omm hard nofile 1000000

omm soft stack unlimited

omm hard stack unlimited

omm soft core unlimited

omm hard core unlimited

omm soft memlock unlimited

EOF
2.10core_pattern设置，为记录数据库异常宕机信息

[root@ccf10 ~]# cat /proc/sys/kernel/core_pattern
[root@ccf10 ~]# echo "/data/core_pattern/core-%e-%p-%t"> /proc/sys/kernel/core_pattern
2.11配置yum源并安装依赖包

umount /dev/sr0
mount /dev/sr0 /mnt

[root@ccf10 yum.repos.d]# vi /etc/yum.repos.d/kylin_x86_64.repo
###Kylin Linux Advanced Server 10 - os repo###
[local]
name=Kylin Linux Advanced Server 10
baseurl=file:///mnt
enabled=1
gpgcheck=0
gpgkey=file:///mnt/RPM-GPG-KEY-kylin

yum repolist
yum install -y zlib-devel libaio libuuid readline-devel krb5-libs libicu libxslt tcl perl openldap pam openssl-devel libxml2 python3
2.12修改默认python版本

[root@ccf10 script]# python -V
Python 2.7.18
[root@ccf10 script]# which python
/usr/bin/python
[root@ccf10 script]# mv /usr/bin/python /usr/bin/pythonbak

[root@ccf10 script]# ln -s /usr/bin/python3
python3 python3.7m python3-chardetect
python3.7 python3.7m-config python3-config
python3.7-config python3.7m-x86_64-config
[root@ccf10 script]# ln -s /usr/bin/python3 /usr/bin/python
[root@ccf10 script]#
[root@ccf10 script]# python -V
Python 3.7.9
2.13设置root用户远程登录

vim /etc/ssh/sshd_config

a.修改权限配置
•注释掉“PermitRootLogin no”。
#PermitRootLogin no
•将“PermitRootLogin”改为“yes”。
PermitRootLogin yes

b.修改Banner配置
vim /etc/ssh/sshd_config
修改Banner配置，注释掉“Banner”所在的行。
#Banner XXXX

systemctl restart sshd.service
2.14对于X86，MTU值推荐1500；对于ARM，MTU值推荐8192。

--ifconfig 网卡名称 mtu mtu值
ifconfig ens32 mtu 8192

对虚拟机内存小的情况，关闭swap交换内存
swapoff -a
3.数据库安装配置（采用cluster_config.xml安装主从）

需配置root与omm用户ssh互信
# 每个节点都执行
ssh-keygen -t rsa # 一路回车
# 将公钥添加到认证文件中
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
# 并设置authorized_keys的访问权限
chmod 600 ~/.ssh/authorized_keys
# 只要在一个节点执行即可。这里在 192.168.6.201上执行
ssh 192.168.6.202 cat ~/.ssh/id_rsa.pub >>~/.ssh/authorized_keys
ssh 192.168.6.203 cat ~/.ssh/id_rsa.pub >>~/.ssh/authorized_keys
# 分发整合后的文件到其它节点
scp ~/.ssh/authorized_keys 192.168.6.202:~/.ssh/
scp ~/.ssh/authorized_keys 192.168.6.203:~/.ssh/
3.1解压文件及配置cluster_config.xml

[root@ccf10 ~]# cd /opt/openGauss/
[root@ccf10 openGauss]# mv /root/openGauss-3.0.0-openEuler-64bit-all.tar.gz ./

tar -zxvf openGauss-3.0.0-openEuler-64bit-all.tar.gz
tar -zxvf openGauss-3.0.0-openEuler-64bit-om.tar.gz

[root@ccf10 openGauss]# cp script/gspylib/etc/conf/cluster_config_template.xml /home/omm/cluster_config.xml
[root@ccf10 openGauss]# vi /home/omm/cluster_config.xml

<?xml version="1.0" encoding="UTF-8"?>
<ROOT>

<CLUSTER>

<PARAM name="clusterName" value="openGauss" />

<PARAM name="nodeNames" value="ccf10,ccf11,ccf12" />

<PARAM name="gaussdbAppPath" value="/opt/openGauss/install/app" />

<PARAM name="gaussdbLogPath" value="/var/log/omm" />

<PARAM name="tmpMppdbPath" value="/opt/openGauss/tmp"/>

<PARAM name="gaussdbToolPath" value="/opt/openGauss/install/om" />

<PARAM name="corePath" value="/data/core_pattern"/>

<PARAM name="backIp1s" value="192.168.6.201,192.168.6.202,192.168.6.203"/>
</CLUSTER>

<DEVICELIST>

<DEVICE sn="omm1">

<PARAM name="name" value="ccf10"/>

<PARAM name="azName" value="AZ1"/>
<PARAM name="azPriority" value="1"/>

<PARAM name="backIp1" value="192.168.6.201"/>
<PARAM name="sshIp1" value="192.168.6.201"/>


<PARAM name="cmsNum" value="1"/>
<PARAM name="cmDir" value="/opt/openGauss/install/cm"/>

<PARAM name="cmServerPortBase" value="8008"/>

<PARAM name="cmServerRelation" value="ccf10,ccf11,ccf12"/>
<PARAM name="cmServerListenIp1" value="192.168.6.201,192.168.6.202,192.168.6.203"/>
<PARAM name="cmServerHaIp1" value="192.168.6.201,192.168.6.202,192.168.6.203"/>

<PARAM name="cmServerlevel" value="1"/>

<PARAM name="dataNum" value="1"/>

<PARAM name="dataPortBase" value="15400"/>

<PARAM name="dataNode1" value="/data/openGauss,ccf11,/data/openGauss,ccf12,/data/openGauss"/>

<PARAM name="dataNode1_syncNum" value="1"/>
</DEVICE>

<DEVICE sn="omm2">

<PARAM name="name" value="ccf11"/>

<PARAM name="azName" value="AZ1"/>
<PARAM name="azPriority" value="1"/>

<PARAM name="backIp1" value="192.168.6.202"/>
<PARAM name="sshIp1" value="192.168.6.202"/>

<PARAM name="cmDir" value="/opt/openGauss/install/cm"/>

<PARAM name="cmServerPortStandby" value="8008"/>
</DEVICE>

<DEVICE sn="omm3">

<PARAM name="name" value="ccf12"/>

<PARAM name="azName" value="AZ1"/>
<PARAM name="azPriority" value="1"/>

<PARAM name="backIp1" value="192.168.6.203"/>
<PARAM name="sshIp1" value="192.168.6.203"/>

<PARAM name="cmDir" value="/opt/openGauss/install/cm"/>

<PARAM name="cmServerPortStandby" value="8008"/>
</DEVICE>
</DEVICELIST>
</ROOT>
3.2执行预安装脚本

[root@ccf10 script]# ./gs_preinstall -U omm -G dbgrp -X /home/omm/cluster_config.xml
[root@ccf10 script]# chown omm:dbgrp -R /opt/openGauss/
3.3执行安装脚本（默认SQL_ASCII字符）

[root@ccf10 script]# su - omm
[omm@ccf10 ~]$ cd /opt/openGauss/script/
[omm@ccf10 script]$ ./gs_install -X /home/omm/cluster_config.xml
Parsing the configuration file.
Check preinstall on every node.
Successfully checked preinstall on every node.
Creating the backup directory.
Successfully created the backup directory.
begin deploy..
Installing the cluster.
begin prepare Install Cluster..
Checking the installation environment on all nodes.
begin install Cluster..
Installing applications on all nodes.
Successfully installed APP.
begin init Instance..
encrypt cipher and rand files for database.
Please enter password for database:
Please repeat for database:
begin to create CA cert files
The sslcert will be generated in /opt/openGauss/install/app/share/sslcert/om
Create CA files for cm beginning.
Create CA files on directory [/opt/openGauss/install/app_02c14696/share/sslcert/cm]. file list: ['cacert.pem', 'server.key', 'server.crt', 'client.key', 'client.crt', 'server.key.cipher', 'server.key.rand', 'client.key.cipher', 'client.key.rand']
Cluster installation is completed.
Configuring.
Deleting instances from all nodes.
Successfully deleted instances from all nodes.
Checking node configuration on all nodes.
Initializing instances on all nodes.
Updating instance configuration on all nodes.
Check consistence of memCheck and coresCheck on database nodes.
Successful check consistence of memCheck and coresCheck on all nodes.
Configuring pg_hba on all nodes.
Configuration is completed.
Starting cluster.
======================================================================
Successfully started primary instance. Wait for standby instance.
======================================================================
.
Successfully started cluster.
======================================================================
cluster_state : Normal
redistributing : No
node_count : 3
Datanode State
primary : 1
standby : 2
secondary : 0
cascade_standby : 0
building : 0
abnormal : 0
down : 0

Successfully installed application.
end deploy..
[omm@ccf10 script]$
3.4安装完成，环境变量修改

[omm@ccf10 script]$ cd
[omm@ccf10 ~]$ cat >> /home/omm/.bashrc <<EOF
export PGPORT=15400 #改成前面cluster_config.xml配置的端口
export PGDATA=/data/openGauss
EOF
[omm@ccf10 ~]$ source .bashrc

检查主从

[omm@ccf10 ~]$ gs_ctl query
[2022-10-07 09:33:52.205][99660][][gs_ctl]: gs_ctl query ,datadir is /data/openGauss
HA state:
local_role : Primary
static_connections : 2
db_state : Normal
detail_information : Normal

Senders info:
sender_pid : 77516
local_role : Primary
peer_role : Standby
peer_state : Normal
state : Streaming
sender_sent_location : 0/60001E8
sender_write_location : 0/60001E8
sender_flush_location : 0/60001E8
sender_replay_location : 0/60001E8
receiver_received_location : 0/60001E8
receiver_write_location : 0/60001E8
receiver_flush_location : 0/60001E8
receiver_replay_location : 0/60001E8
sync_percent : 100%
sync_state : Quorum
sync_priority : 1
sync_most_available : Off
channel : 192.168.6.201:15401-->192.168.6.203:31106

sender_pid : 77522
local_role : Primary
peer_role : Standby
peer_state : Normal
state : Streaming
sender_sent_location : 0/60001E8
sender_write_location : 0/60001E8
sender_flush_location : 0/60001E8
sender_replay_location : 0/60001E8
receiver_received_location : 0/60001E8
receiver_write_location : 0/60001E8
receiver_flush_location : 0/60001E8
receiver_replay_location : 0/60001E8
sync_percent : 100%
sync_state : Quorum
sync_priority : 1
sync_most_available : Off
channel : 192.168.6.201:15401-->192.168.6.202:34426

Receiver info:
No information
[omm@ccf10 ~]$

[omm@ccf10 ~]$ gs_om -t status --detail
[ CMServer State ]

node node_ip instance state
-------------------------------------------------------------------------
1 ccf10 192.168.6.201 1 /opt/openGauss/install/cm/cm_server Primary
2 ccf11 192.168.6.202 2 /opt/openGauss/install/cm/cm_server Standby
3 ccf12 192.168.6.203 3 /opt/openGauss/install/cm/cm_server Standby

[ Cluster State ]

cluster_state : Normal
redistributing : No
balanced : Yes
current_az : AZ_ALL

[ Datanode State ]

node node_ip instance state
---------------------------------------------------------------
1 ccf10 192.168.6.201 6001 /data/openGauss P Primary Normal
2 ccf11 192.168.6.202 6002 /data/openGauss S Standby Normal
3 ccf12 192.168.6.203 6003 /data/openGauss S Standby Normal
[omm@ccf10 ~]$
3.5设置备机可读

备机可读特性为可选特性，需要修改配置参数并重启主备机器后才能使用。在开启备机可读之后，备机将支持读操作，并满足数据一致性要求。
操作步骤
1.如果主备机上的openGauss数据库实例正在运行，请先分别停止主备机上的数据库实例。
2.分别打开主机与备机的postgresql.conf配置文件，找到并将对应参数修改为：wal_level=hot_standby；hot_standby = on。默认装完正确的
3.参数max_standby_streaming_delay, max_prepared_transactions, max_standby_archive_delay, hot_standby_feedback可以参考开发者指南中参数说明按需进行设置。
4.修改完成后，分别启动主备机即可。

[omm@ccf10 ~]$ grep -Ev '^$|^\s*#' $PGDATA/postgresql.conf #默认值
listen_addresses = 'localhost,192.168.6.201' # what IP address(es) to listen on;
local_bind_address = '192.168.6.201'
port = 15400 # (change requires restart)
max_connections = 5000 # (change requires restart)
unix_socket_directory = '/opt/openGauss/tmp' # (change requires restart)
unix_socket_permissions = 0700 # begin with 0 to use octal notation
session_timeout = 10min # allowed duration of any unused session, 0s-86400s(1 day), 0 is disabled
ssl = on # (change requires restart)
ssl_cert_file = 'server.crt' # (change requires restart)
ssl_key_file = 'server.key' # (change requires restart)
ssl_ca_file = 'cacert.pem' # (change requires restart)
modify_initial_password = true #Whether to change the initial password of the initial user
max_process_memory = 2GB
shared_buffers = 553MB # min 128kB
bulk_write_ring_size = 2GB # for bulkload, max shared_buffers
max_prepared_transactions = 800 # zero disables the feature
work_mem = 64MB # min 64kB
maintenance_work_mem = 128MB # min 1MB
cstore_buffers = 1GB #min 16MB
wal_level = hot_standby # minimal, archive, hot_standby or logical
checkpoint_segments = 64 # in logfile segments, min 1, 16MB each
enable_incremental_checkpoint = on # enable incremental checkpoint
incremental_checkpoint_timeout = 60s # range 1s-1h
max_wal_senders = 16 # max number of walsender processes
wal_keep_segments = 16 # in logfile segments, 16MB each; 0 disables
enable_slot_log = off
max_replication_slots = 8 # max number of replication slots.i
replconninfo1 = 'localhost=192.168.6.201 localport=15401 localheartbeatport=15405 localservice=15404 remotehost=192.168.6.202 remoteport=15401 remoteheartbeatport=15405 remoteservice=15404' # replication connection information used to connect primary on standby, or standby on primary,
replconninfo2 = 'localhost=192.168.6.201 localport=15401 localheartbeatport=15405 localservice=15404 remotehost=192.168.6.203 remoteport=15401 remoteheartbeatport=15405 remoteservice=15404' # replication connection information used to connect secondary on primary or standby,
synchronous_standby_names = 'ANY 1(dn_6002,dn_6003)' # standby servers that provide sync rep
data_replicate_buffer_size = 128MB # data replication buffer size
walsender_max_send_size = 8MB # Size of walsender max send size
enable_data_replicate = off
hot_standby = on # "on" allows queries during recovery
enable_mergejoin = off
enable_nestloop = off
enable_kill_query = off # optional: [on, off], default: off
logging_collector = on # Enable capturing of stderr and csvlog
log_directory = '/var/log/omm/omm/pg_log/dn_6001' # directory where log files are written,
log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log' # log file name pattern,
log_file_mode = 0600 # creation mode for log files,
log_rotation_size = 20MB # Automatic rotation of logfiles will
log_min_duration_statement = 1800000 # -1 is disabled, 0 logs all statements
log_connections = off # log connection requirement from client
log_disconnections = off # log disconnection from client
log_duration = off # log the execution time of each query
log_hostname = off # log hostname
log_line_prefix = '%m %c %d %p %a %x %n %e ' # special values:
log_timezone = 'PRC'
enable_alarm = on
connection_alarm_rate = 0.9
alarm_report_interval = 10
alarm_component = '/opt/huawei/snas/bin/snas_cm_cmd'
use_workload_manager = off # Enables workload manager in the system.
autovacuum = on # Enable autovacuum subprocess? default value is 'on'
datestyle = 'iso, mdy'
timezone = 'PRC'
lc_messages = 'C' # locale for system error message
lc_monetary = 'C' # locale for monetary formatting
lc_numeric = 'C' # locale for number formatting
lc_time = 'C' # locale for time formatting
default_text_search_config = 'pg_catalog.english'
lockwait_timeout = 1200s # Max of lockwait_timeout and deadlock_timeout + 1s
pgxc_node_name = 'dn_6001_6002_6003' # Coordinator or Datanode name
audit_enabled = on
audit_directory = '/var/log/omm/omm/pg_audit/dn_6001'
explain_perf_mode = pretty
job_queue_processes = 10 # Number of concurrent jobs, optional: [0..1000], default: 10.
replication_type = 1
application_name = 'dn_6001'
recovery_max_workers = 4
enable_global_syscache = off
enable_double_write = on
available_zone = 'AZ1'

以下为修改内容：
sed -i 's/max_connections \= 5000/max_connections \= 8000/g' $PGDATA/postgresql.conf
sed -i 's/max_process_memory \= 2GB/max_process_memory \= 2GB/g' $PGDATA/postgresql.conf #75%MEM
sed -i 's/shared_buffers \= 553MB/shared_buffers \= 600MB/g' $PGDATA/postgresql.conf #25%MEM
sed -i 's/work_mem \= 64MB/work_mem \= 64MB/g' $PGDATA/postgresql.conf
sed -i 's/maintenance_work_mem \= 128MB/maintenance_work_mem \= 128MB/g' $PGDATA/postgresql.conf
sed -i 's/cstore_buffers \= 16MB/cstore_buffers \= 16MB/g' $PGDATA/postgresql.conf
sed -i 's/session_timeout \= 10min/session_timeout \= 0/g' $PGDATA/postgresql.conf

cat >> $PGDATA/postgresql.conf<<EOF

effective_cache_size=1GB #75% OS_MEM
vacuum_cost_limit = 10000
archive_mode = on
archive_dest='/data/archive_wals'
autovacuum_max_workers=5
autovacuum_naptime=20s
autovacuum_vacuum_cost_delay=0
track_sql_count=on
log_statement='ddl'
password_reuse_time=90
password_encryption_type=0 #如果要使用pg兼容的客户端工具,建议设置成0
random_page_cost=1.4 #根据实际情况来定，如果是SSD建议1.2或者1.4
password_effect_time = 0 #The password effect time(0-999)，默认值90d
password_notify_time = 0 #The password notify time(0-999)，默认值7d
max_files_per_process = 100000 # 允许同时打开的files的最大数量
track_activity_query_size=4096 # 设置用于跟踪每一个活动会话的当前正在执行命令的字节数
remote_read_mode=non_authentication
hot_standby_feedback = on
EOF

[omm@ccf10 ~]$ grep -Ev '^$|^\s*#' $PGDATA/postgresql.conf
3.6集群状态查询及启停

（1）状态查询
[omm@ccf10 ~]$ cm_ctl query -Cv
[ CMServer State ]

node instance state
-------------------------
1 ccf10 1 Primary
2 ccf11 2 Standby
3 ccf12 3 Standby

[ Cluster State ]

cluster_state : Normal
redistributing : No
balanced : Yes
current_az : AZ_ALL

[ Datanode State ]

node instance state | node instance state | node instance state
---------------------------------------------------------------------------------------------------------------
1 ccf10 6001 P Primary Normal | 2 ccf11 6002 S Standby Normal | 3 ccf12 6003 S Standby Normal
[omm@ccf10 ~]$

（2）集群启停
启动集群，可以在任一节点执行启停。
cm_ctl stop
cm_ctl start

单独启停节点1服务
cm_ctl stop -n 1 -D $PGDATA
cm_ctl start -n 1 -D $PGDATA
3.7验证

[omm@ccf10 ~]$ gsql -d postgres -r
gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:19 commit 0 last mr )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

openGauss=# CREATE DATABASE mydb WITH ENCODING 'GBK' template = template0;
CREATE DATABASE
openGauss=# CREATE DATABASE mydb1 WITH ENCODING 'UTF8' template = template0;
CREATE DATABASE
openGauss=#
openGauss=# \c mydb
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "mydb" as user "omm".
mydb=# CREATE USER ccf IDENTIFIED BY 'Ccf.1234';
CREATE ROLE
mydb=#
mydb=# CREATE TABLESPACE tbs_ccf RELATIVE LOCATION 'tablespace/tablespace_1';
CREATE TABLESPACE
mydb=# GRANT CREATE ON TABLESPACE tbs_ccf TO ccf;
GRANT
mydb=# create table ccf.chen01(i int);
CREATE TABLE
mydb=# insert into ccf.chen01 values(1);
INSERT 0 1
mydb=# select * from ccf.chen01;
i
---
1
(1 row)

mydb=#

测试建库建表均成功在备库查询到，创建完成。
高可用测试：
模拟主节点故障，测试是否自动进行选主。

[root@ccf10 ~]# shutdown -h now

[omm@ccf12 ~]$ cm_ctl query -Cv
[ CMServer State ]

node instance state
-------------------------
1 ccf10 1 Down
2 ccf11 2 Standby
3 ccf12 3 Primary

[ Cluster State ]

cluster_state : Degraded
redistributing : No
balanced : No
current_az : AZ_ALL

[ Datanode State ]

node instance state | node instance state | node instance state
---------------------------------------------------------------------------------------------------------------
1 ccf10 6001 P Down Unknown | 2 ccf11 6002 S Primary Normal | 3 ccf12 6003 S Standby Normal
[omm@ccf12 ~]$
如上节点2是主，测试成功。

启动1节点自动启动并加入集群，作为standby节点

[omm@ccf10 ~]$ gs_om -t status --detail
[ CMServer State ]

node node_ip instance state
-------------------------------------------------------------------------
1 ccf10 192.168.6.201 1 /opt/openGauss/install/cm/cm_server Standby
2 ccf11 192.168.6.202 2 /opt/openGauss/install/cm/cm_server Standby
3 ccf12 192.168.6.203 3 /opt/openGauss/install/cm/cm_server Primary

[ Cluster State ]

cluster_state : Normal
redistributing : No
balanced : No
current_az : AZ_ALL

[ Datanode State ]

node node_ip instance state
---------------------------------------------------------------
1 ccf10 192.168.6.201 6001 /data/openGauss P Standby Normal
2 ccf11 192.168.6.202 6002 /data/openGauss S Primary Normal
3 ccf12 192.168.6.203 6003 /data/openGauss S Standby Normal
[omm@ccf10 ~]$ cm_ctl query -Cv
[ CMServer State ]

node instance state
-------------------------
1 ccf10 1 Standby
2 ccf11 2 Standby
3 ccf12 3 Primary

[ Cluster State ]

cluster_state : Normal
redistributing : No
balanced : No
current_az : AZ_ALL

[ Datanode State ]

node instance state | node instance state | node instance state
---------------------------------------------------------------------------------------------------------------
1 ccf10 6001 P Standby Normal | 2 ccf11 6002 S Primary Normal | 3 ccf12 6003 S Standby Normal
[omm@ccf10 ~]$

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