文档中心MogDBMogDB StackUqbar
v2.0

文档:v2.0

支持的版本:

其他版本:

部署运维FAQs


初始化环境FAQs

Q1: clusterconfig.xml示例配置文件需要修改哪些参数?

需要修改机器名和IP地址。

<?xml version="1.0" encoding="UTF-8"?>
<ROOT>
    <!-- MogDB整体信息 -->
    <CLUSTER>
        <PARAM name="clusterName" value="dbCluster" />
        <PARAM name="nodeNames" value="mogdb-kernel-0002" />
        <PARAM name="backIp1s" value="172.16.0.245"/>
        <PARAM name="gaussdbAppPath" value="/opt/mogdb/app" />
        <PARAM name="gaussdbLogPath" value="/opt/mogdb/mogdb_log/omm" />
        <PARAM name="gaussdbToolPath" value="/opt/mogdb/tool" />
        <PARAM name="corePath" value="/opt/mogdb/corefile"/>
        <PARAM name="clusterType" value="single-inst"/>
    </CLUSTER>

<!-- 每台服务器上的节点部署信息 -->
    <DEVICELIST>
        <!-- mogdb-kernel-0002上的节点部署信息 -->
        <DEVICE sn="1000001">
            <PARAM name="name" value="mogdb-kernel-0002"/>
            <PARAM name="azName" value="AZ1"/>
            <PARAM name="azPriority" value="1"/>
            <!-- 如果服务器只有一个网卡可用,将backIP1和sshIP1配置成同一个IP -->
            <PARAM name="backIp1" value="172.16.0.245"/>
            <PARAM name="sshIp1" value="172.16.0.245"/>

            <!--dbnode-->
            <PARAM name="dataNum" value="1"/>
            <PARAM name="dataPortBase" value="26000"/>
            <PARAM name="dataNode1" value="/mogdb/data/db1"/>
        </DEVICE>
    </DEVICELIST>
</ROOT>

初始化脚本FAQs

Q2: 当提示配置文件参数值与系统环境变量值不相符怎么办?

Failed to check the preinstall repeat condition.gaussdbToolPath [/opt/enmo/wisery] is not same with environment [/opt/mogdb/tool]

clusterconfig.xml文件里gaussdbToolPath的值改为/opt/mogdb/tool

说明:

  • 出现此类问题,主要是因为系统之前安装过MogDB,环境可能未清理干净,所以会产生配置文件参数值与系统环境变量值不相符的情况,将导致执行失败。将clusterconfig.xml配置文件中报错参数的值改为和环境变量文件参数值相同即可。
  • omm用户下执行vi ~/.bashrc可查看环境变量。

Q3: 当提示无权限执行该命令,怎么办?

Fixing server package owner.
[GAUSS-51400] : Failed to execute the command: su - omm -c 'cd '/opt/software/mogdb/''. Error:
-bash: line 0: cd: /opt/software/mogdb/: Permission denied

执行chmod 755 -R /opt/software为该目录赋予权限后,再重新执行脚本初始化命令。

Q4: 当符号链接创建失败怎么办?

In:failed to create symbolic link 'usr/bin/python3': File exists

usr/bin/目录下的python3删掉,重新执行In命令。

Q5: 当提示主机名不在集群中时怎么办?

GAUSS-51619: "The host name [host-172-16-0-195] is not in the cluster."

这是因为机器实际的名称是host-172-16-0-195,而不是mogdb-kernel-0006,所以需要将clusterconfig.xml里的节点名称改为host-172-16-0-195

Q6: 当出现如下报错时,怎么办?

[GAUSS-50202]:The /opt/mogdb must be empty. Or user [omm] has write permission to directory /opt/mogdb. Because it will create symbolic link [/opt/mogdb/app] to install path [/opt/mogdb/app_e0e9f58d] in gs_install process with this user.

omm用户下,执行vi ~/.bashrc,将环境变量清空,重新执行初始化脚本即可成功。

Q7: 当出现如下有关依赖包的报错时,怎么办?

/opt/software/mogdb/bin/mogdb: error while loading shared libraries: libnsl.so.1: cannot open shared object file: No such file or directory
no data was returned by command ""/opt/software/mogdb/bin/mogdb" -V"
The program "mogdb" is needed by gs_initdb but was not found in the
same directory as "/opt/software/mogdb/bin/gs_initdb".
Check your installation.

重新安装依赖包libnsl*即可。


安装FAQs

Q8: 当提示集群已安装怎么办?

[GAUSS-51400] : Failed to execute the command: source /home/omm/.bashrc;python3 '/opt/mogdb/tool/script/local/CheckInstall.py' -U omm:dbgrp -R /opt/mogdb/app -l /opt/mogdb/mogdb_log/omm/omm/om/gs_local.log -X /opt/software/mogdb/clusterconfig.xml.Error:
Checking old installation.
[GAUSS-51806] : The cluster has been installed.

执行vi ~/.bashrc查看环境变量,将GAUSS_ENV=2改为GAUSS_ENV=1,重新执行安装命令即可。

Q9: 当执行安装命令报如下错误怎么办?

[GAUSS-51400] : Failed to execute the command: source /home/omm/.bashrc;python3 '/opt/mogdb/tool/script/local/CheckInstall.py' -U omm:dbgrp -R /opt/mogdb/app -l /opt/mogdb/mogdb_log/omm/omm/om/gs_local.log -X /opt/software/mogdb/clusterconfig.xml.Error:
Checking old installation.
Successfully checked old installation.
Checking SHA256.
Successfully checked SHA256.
Checking kernel parameters.
Successfully checked kernel parameters.
Checking directory.
[GAUSS-50202] : The /opt/mogdb/app_b75b585a must be empty.

root用户下,进入/opt/mogdb/app_b75b585a目录,执行rm -rf *将目录下所有文件删除,重新执行安装命令即可。

Q10: 当错误提示socket被占用怎么办?

[GAUSS-50200] : The socket file already exists. Port:26000.

clusterconfig.xml文件里的dataPortBase值改为一个可用的端口即可。


部署后FAQs

gs_om -t start启动数据库失败:"在标准安装后,通过hostnamectl set修改主机名"

适用于:

  • MogDB 1.1.0

  • MogDB 2.0.0

  • MogDB 2.0.1

  • MogDB 单机数据库

本文档中的信息适用于x86平台。

症状

在标准安装结束后(单机),通过hostnamectl set修改主机名,执行gs_om -t start命令数据库启动失败。

例如:

  1. root用户下通过hostnamectl set将主机名mogdb-kernel-0005修改为www.mogdb.com

    [root@mogdb-kernel-0005 ~]# hostnamectl
       Static hostname: mogdb-kernel-0005
             Icon name: computer-vm
               Chassis: vm
            Machine ID: de03a5f3bf5a4b7e9df939c9dc5b428d
               Boot ID: 828bfbe948ed4de7aff2a059103a0eaa
        Virtualization: kvm
      Operating System: CentOS Linux 7 (Core)
           CPE OS Name: cpe:/o:centos:centos:7
                Kernel: Linux 3.10.0-1160.15.2.el7.x86_64
          Architecture: x86-64
    [root@mogdb-kernel-0005 ~]# id
    uid=0(root) gid=0(root) groups=0(root)
    [root@mogdb-kernel-0005 ~]# hostname
    mogdb-kernel-0005
    [root@mogdb-kernel-0005 ~]# hostnamectl set-hostname www.mogdb.com
  2. 在任意用户下执行如下命令查看是否主机名修改成功。

    [root@mogdb-kernel-0005 ~]# hostname
    www.mogdb.com
  3. omm用户下执行如下命令停止数据库。

    [root@mogdb-kernel-0005 ~]# su - omm
    Last login: Tue Jul 27 11:18:16 CST 2021 on pts/1
    [omm@www ~]$ gs_ctl stop -D /mogdb/data/db1
    [2021-07-27 11:19:20.283][32166][][gs_ctl]: gs_ctl stopped ,datadir is /mogdb/data/db1
    waiting for server to shut down.... done
    server stopped
  4. omm用户下执行如下命令启动数据库。

    [omm@www ~]$ gs_om -t start
    
    Starting cluster.
    =========================================
    
    =========================================
    [GAUSS-53600]: Can not start the database, the cmd is source /home/omm/.bashrc; python3 '/opt/enmo/wisequery/script/local/StartInstance.py' -U omm -R /opt/mogdb/app -t 300 --security-mode=off,  Error:
    [GAUSS-51400] : Failed to execute the command: source /home/omm/.bashrc; python3 '/opt/enmo/wisequery/script/local/StartInstance.py' -U omm -R /opt/mogdb/app -t 300 --security-mode=off. Error:
    [FAILURE] mogdb-kernel-0005

目的:

在标准安装结束后(单机),通过modip.py脚本修改主机名,执行gs_om -t start命令,数据库启动成功。

故障解决步骤:

  1. omm用户创建modip.py脚本文件。

    [omm@www ~]$ cd
    [omm@www ~]$ pwd
    /home/omm
    [omm@www ~]$ vi modip.py
    
    # -*- coding:utf-8 -*-
    
    import sys
    ##sys.path.append(r'$GPHOME/script/')
    sys.path.append(r'/opt/enmo/wisequery/script/')
    from gspylib.common.DbClusterInfo import dbClusterInfo
    
    oldIP = '172.16.0.176'
    newIP = '172.16.0.176'
    oldnodename = 'mogdb-kernel-0005'
    newnodename = 'www.mogdb.com'
    ##Output file directory
    tmpDir = r'/home/omm'
    dbuser = 'omm'
    
    c1=dbClusterInfo()
    c1.initFromStaticConfig(dbuser)
    
    for node in c1.dbNodes:
        if node.backIps[0] == oldIP:
            node.backIps[0] = newIP
        if len(node.virtualIp):
            if node.virtualIp[0] == oldIP:
                node.virtualIp[0] = newIP
        if node.name == oldnodename:
            node.name = newnodename
        if node.sshIps[0] == oldIP:
            node.sshIps[0] = newIP
        for dn in node.datanodes:
            if dn.listenIps[0] == oldIP:
                dn.listenIps[0] = newIP
            if dn.haIps[0] == oldIP:
                dn.haIps[0] = newIP
            for peerdn in dn.peerInstanceInfos:
                if len(peerdn.peerHAIPs):
                    if peerdn.peerHAIPs[0] == oldIP:
                        peerdn.peerHAIPs[0] = newIP
    for node in c1.dbNodes:
        staticConfigPath_dn = "%s/cluster_static_config_%s" % (tmpDir, node.name)
        c1.saveToStaticConfig(staticConfigPath_dn, node.id)
        print(staticConfigPath_dn)

    说明: 需根据实际情况,修改主机IP地址和主机名。例如,在本示例中,主机IP地址为172.16.0.176,旧主机名为mogdb-kernel-0005,新主机名为www.mogdb.com

  2. 执行如下命令生成集群静态配置文件。

    [omm@www ~]$ python3 modip.py

    回显如下即执行成功。

    /home/omm/cluster_static_config_www.mogdb.com
  3. 执行如下命令替换源文件。

    [omm@www ~]$ mv /opt/mogdb/app/bin/cluster_static_config /opt/mogdb/app/bin/cluster_static_config_mogdb.com
    
    [omm@www ~]$ cp /home/omm/cluster_static_config_www.mogdb.com /opt/mogdb/app/bin/cluster_static_config
  4. 执行如下命令启动数据库。

    [omm@www ~]$ gs_om -t start
    
    Starting cluster.
    =========================================
    
    [SUCCESS] www.mogdb.com
    
    2021-07-26 16:20:42.938 60fe7056.1 [unknown] 139667408496384 [unknown] 0 dn_6001 01000  0 [BACKEND] WARNING: could not create any HA TCP/IP sockets
    =========================================
    
    Successfully started.
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