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openGaussDB 初体验（上）
作者 | JiekeXu
来源 | JiekeXu之路（ID: JiekeXu_IT）
转载请联系授权 | (微信ID：xxq1426321293)
大家好，我是 JiekeXu,很高兴又和大家见面了，今天分享下 openGaussDB 初体验(上)。本文首发于微信公众号【JiekeXu之路】，欢迎点击上方蓝字关注我吧！
一、openGaussDB 介绍
openGaussDB(openGauss)是华为云深度融合在数据库领域多年的经验，结合企业级场景需求，推出的新一代企业级分布式数据库，支持集中式与分布式两种部署形态。在支撑传统业务的基础上，持续构建竞争力特性，为企业面向 5G 时代的挑战，提供了无限可能。 早在 2019 年的华为 HDC 大会，官方就已经正式宣布，华为将于 2020 年 6 月 30 日，开源其单机数据库 openGauss，这一承诺已经准时兑现。
开源后的 openGauss 其官网为：
https://opengauss.org/zh/
源码开放地址：
https://gitee.com/opengauss
GitHub 镜像：
https://github.com/opengauss-mirror
在墨天轮国产数据库排行榜上，TiDB 稳居第一，OceanBase 居第二，DM（达梦） 居第三，希望在社区的推动之下，openGauss 会迎来更加广阔的发展空间，能够跻身前三！
2019 年已经是国产数据库元年，早在去年数据嘉年华大会上， 对于数据库技术百花齐放的时代 Oracle ACED专家盖国强（Eygle）提出“一主一备双引擎，一洋一中保无虞”的观点，前段时间数据库技术深度脱口秀上还看到盖总的十四字箴言，盖总就说过“一主一备双引擎，开源商用两相宜”，什么意思呢？大概就是现在学习数据库技术不能只单单学一种数据库了，至少要学习两到三门数据库知识，既要学习类似 Oracle 的商用数据库，还要学习开源数据库，既要学习国外的数据库也要学习国产数据库。足以证明国产数据库将会蓬勃发展，学习国产数据库势在必行。根据上面的排行榜，赶紧挑选自己喜欢的数据库来练练手吧。
视频如下：
二、安装前准备
软件包官网下载地址：
https://opengauss.org/zh/download.html
如下，将下载的软件包传至服务器，检验 sha256sum 值和官网一致，说明软件下载无损坏，可正常使用。
[root@openGauss app]# lltotal 60960-rw-r--r--. 1 root root 62419226 Jul 9 11:40 openGauss-1.0.0-CentOS-64bit.tar.gz[root@openGauss app]#[root@openGauss app]# sha256sum openGauss-1.0.0-CentOS-64bit.tar.gzc8fc757de0438a3e06add570b54b34561147a7aeb847b7eb72f2d161550670eb openGauss-1.0.0-CentOS-64bit.tar.gz（1）使虚拟机能够上网，配置网络 yum 源
首先网络适配器选择【NAT】模式
查看宿主机无线适配器关于 net8 的网络配置
然后 VM 里选择【编辑】——>【虚拟网络编辑器】——>【DHCP设置】
子网 IP 需要和前面看到的在同一网段里，然后选择 DHCP 自动获取。
最后需要修改网卡 ens33，将 BOOTPROTO 由 “none”改为 “dhcp”自动获取，重启网卡虚拟机便可以上网了。
[root@openGauss network-scripts]# service network restartRestarting network (via systemctl): [ OK ][root@openGauss network-scripts]# ping www.baidu.comPING www.a.shifen.com (182.61.200.7) 56(84) bytes of data.64 bytes from 182.61.200.7 (182.61.200.7): icmp_seq=1 ttl=128 time=12.4 ms64 bytes from 182.61.200.7 (182.61.200.7): icmp_seq=2 ttl=128 time=6.12 ms64 bytes from 182.61.200.7 (182.61.200.7): icmp_seq=3 ttl=128 time=5.76 ms^C--- www.a.shifen.com ping statistics ---3 packets transmitted, 3 received, 0% packet loss, time 2003msrtt min/avg/max/mdev = 5.766/8.114/12.452/3.072 ms（2）查看 yum 源，安装 Python3.6
[root@openGauss ~]# cd /etc/yum.repos.d/[root@openGauss yum.repos.d]# lltotal 32-rw-r--r--. 1 root root 1664 Nov 23 2018 CentOS-Base.repo-rw-r--r--. 1 root root 1309 Nov 23 2018 CentOS-CR.repo-rw-r--r--. 1 root root 649 Nov 23 2018 CentOS-Debuginfo.repo-rw-r--r--. 1 root root 314 Nov 23 2018 CentOS-fasttrack.repo-rw-r--r--. 1 root root 630 Nov 23 2018 CentOS-Media.repo-rw-r--r--. 1 root root 1331 Nov 23 2018 CentOS-Sources.repo-rw-r--r--. 1 root root 5701 Nov 23 2018 CentOS-Vault.repo[root@openGauss yum.repos.d]#[root@openGauss yum.repos.d]#[root@openGauss yum.repos.d]# yum repolistLoaded plugins: fastestmirror, langpacksLoading mirror speeds from cached hostfile* base: ftp.sjtu.edu.cn* extras: mirrors.bfsu.edu.cn* updates: ftp.sjtu.edu.cnrepo id repo name status!base/7/x86_64 CentOS-7 - Base 10,070!extras/7/x86_64 CentOS-7 - Extras 412!updates/7/x86_64 CentOS-7 - Updates 890repolist: 11,372[root@openGauss yum.repos.d]#[root@openGauss yum.repos.d]#[root@openGauss yum.repos.d]# yum listLoaded plugins: fastestmirror, langpacksLoading mirror speeds from cached hostfile* base: mirrors.bfsu.edu.cn* extras: mirrors.aliyun.com* updates: mirrors.aliyun.comInstalled PackagesGConf2.x86_64 3.2.6-8.el7 @anacondaGeoIP.x86_64 1.5.0-13.el7 @anacondaModemManager.x86_64 1.6.10-1.el7 @anacondaModemManager-glib.x86_64 1.6.10-1.el7 @anacondaNetworkManager.x86_64 1:1.12.0-6.el7 @anaconda.................(省略包信息)..............
[root@openGauss yum.repos.d]# yum install python3.6*Loaded plugins: fastestmirror, langpacksLoading mirror speeds from cached hostfile* base: mirrors.bfsu.edu.cn* extras: mirrors.bfsu.edu.cn* updates: mirrors.bfsu.edu.cnbase | 3.6 kB 00:00:00 extras | 2.9 kB 00:00:00 updates | 2.9 kB 00:00:00 Resolving Dependencies--> Running transaction check---> Package python3-pip.noarch 0:9.0.3-7.el7_7 will be installed--> Processing Dependency: python(abi) = 3.6 for package: python3-pip-9.0.3-7.el7_7.noarch--> Processing Dependency: /usr/bin/python3 for package: python3-pip-9.0.3-7.el7_7.noarch---> Package python3-setuptools.noarch 0:39.2.0-10.el7 will be installed---> Package python3-wheel.noarch 0:0.31.1-5.el7_7 will be installed--> Running transaction check---> Package python3.x86_64 0:3.6.8-13.el7 will be installed--> Processing Dependency: python3-libs(x86-64) = 3.6.8-13.el7 for package: python3-3.6.8-13.el7.x86_64--> Processing Dependency: libpython3.6m.so.1.0()(64bit) for package: python3-3.6.8-13.el7.x86_64--> Running transaction check---> Package python3-libs.x86_64 0:3.6.8-13.el7 will be installed--> Finished Dependency ResolutionDependencies Resolved===================================================================================================================================Package Arch Version Repository Size===================================================================================================================================Installing:python3-pip noarch 9.0.3-7.el7_7 updates 1.8 Mpython3-setuptools noarch 39.2.0-10.el7 base 629 kpython3-wheel noarch 0.31.1-5.el7_7 base 63 kInstalling for dependencies:python3 x86_64 3.6.8-13.el7 base 69 kpython3-libs x86_64 3.6.8-13.el7 base 7.0 MTransaction Summary===================================================================================================================================Install 3 Packages (+2 Dependent packages)Total download size: 9.5 MInstalled size: 48 MIs this ok [y/d/N]: yDownloading packages:warning: /var/cache/yum/x86_64/7/base/packages/python3-3.6.8-13.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEYPublic key for python3-3.6.8-13.el7.x86_64.rpm is not installed(1/5): python3-3.6.8-13.el7.x86_64.rpm | 69 kB 00:00:00 (2/5): python3-wheel-0.31.1-5.el7_7.noarch.rpm | 63 kB 00:00:00 (3/5): python3-setuptools-39.2.0-10.el7.noarch.rpm | 629 kB 00:00:01 Public key for python3-pip-9.0.3-7.el7_7.noarch.rpm is not installed==- ] 897 kB/s | 3.4 MB 00:00:06 ETA(4/5): python3-pip-9.0.3-7.el7_7.noarch.rpm | 1.8 MB 00:00:02 (5/5): python3-libs-3.6.8-13.el7.x86_64.rpm | 7.0 MB 00:00:04 -----------------------------------------------------------------------------------------------------------------------------------Total 1.9 MB/s | 9.5 MB 00:00:05 Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7Importing GPG key 0xF4A80EB5:Userid : "CentOS-7 Key (CentOS 7 Official Signing Key) <security@centos.org>"Fingerprint: 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5Package : centos-release-7-6.1810.2.el7.centos.x86_64 (@anaconda)From : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7Is this ok [y/N]: yRunning transaction checkRunning transaction testTransaction test succeededRunning transaction Installing : python3-setuptools-39.2.0-10.el7.noarch 1/5 Installing : python3-libs-3.6.8-13.el7.x86_64 2/5 Installing : python3-3.6.8-13.el7.x86_64 3/5 Installing : python3-pip-9.0.3-7.el7_7.noarch 4/5 Installing : python3-wheel-0.31.1-5.el7_7.noarch 5/5 Verifying : python3-pip-9.0.3-7.el7_7.noarch 1/5 Verifying : python3-3.6.8-13.el7.x86_64 2/5 Verifying : python3-wheel-0.31.1-5.el7_7.noarch 3/5 Verifying : python3-setuptools-39.2.0-10.el7.noarch 4/5 Verifying : python3-libs-3.6.8-13.el7.x86_64 5/5Installed: python3-pip.noarch 0:9.0.3-7.el7_7 python3-setuptools.noarch 0:39.2.0-10.el7 python3-wheel.noarch 0:0.31.1-5.el7_7 Dependency Installed: python3.x86_64 0:3.6.8-13.el7 python3-libs.x86_64 0:3.6.8-13.el7 Complete![root@openGauss yum.repos.d]#(3) 查看 Ptrhon3
由于 CentOS7 默认安装了 Python2.7，直接敲命令 python3 直接进入 python 交互式环境，默认安装了 Python3.6.8。因为 openGauss 依赖 Python3 环境，故需要安装 Python3.6，也是建议按照此版本。
[root@openGauss opt]# python3Python 3.6.8 (default, Apr 2 2020, 13:34:55)[GCC 4.8.5 20150623 (Red Hat 4.8.5-39)] on linuxType "help", "copyright", "credits" or "license" for more information.>>>>>> exit()[root@openGauss opt]# python2Python 2.7.5 (default, Oct 30 2018, 23:45:53)[GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux2Type "help", "copyright", "credits" or "license" for more information.>>>>>> quit()[root@openGauss opt]# pythonPython 2.7.5 (default, Oct 30 2018, 23:45:53)[GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux2Type "help", "copyright", "credits" or "license" for more information.>>> quit()[root@openGauss opt]# which python/usr/bin/python[root@openGauss opt]# which python2/usr/bin/python2[root@openGauss opt]# which python3/usr/bin/python3[root@openGauss opt]# cd /usr/bin[root@openGauss bin]# ll python*lrwxrwxrwx. 1 root root 7 Jul 8 21:42 python -> python2lrwxrwxrwx. 1 root root 9 Jul 8 21:42 python2 -> python2.7-rwxr-xr-x. 1 root root 7216 Oct 31 2018 python2.7lrwxrwxrwx. 1 root root 9 Jul 11 18:57 python3 -> python3.6-rwxr-xr-x. 2 root root 11336 Apr 2 21:37 python3.6-rwxr-xr-x. 2 root root 11336 Apr 2 21:37 python3.6m（4）安装所需要的软件包
如下所示，有些包没安装也可以正常通过。
[root@openGauss yum.repos.d]# yum install -y libaio-devel \ flex \ bison \ ncurses-devel \ glibc-devel \ patch \ lsb_releaseLoaded plugins: fastestmirror, langpacksLoading mirror speeds from cached hostfile* base: mirrors.bfsu.edu.cn* extras: mirrors.bfsu.edu.cn* updates: mirrors.bfsu.edu.cnNo package flex available.No package bison available.No package ncurses-devel available.No package glibc-devel available.No package patch available.No package lsb_release available.Resolving Dependencies--> Running transaction check---> Package libaio-devel.x86_64 0:0.3.109-13.el7 will be installed--> Finished Dependency ResolutionDependencies Resolved===================================================================================================================================Package Arch Version Repository Size===================================================================================================================================Installing:libaio-devel x86_64 0.3.109-13.el7 base 13 kTransaction Summary===================================================================================================================================Install 1 PackageTotal download size: 13 kInstalled size: 7.8 kDownloading packages:libaio-devel-0.3.109-13.el7.x86_64.rpm | 13 kB 00:00:00 Running transaction checkRunning transaction testTransaction test succeededRunning transaction Installing : libaio-devel-0.3.109-13.el7.x86_64 1/1 Verifying : libaio-devel-0.3.109-13.el7.x86_64 1/1Installed: libaio-devel.x86_64 0:0.3.109-13.el7 Complete!（5）关闭防火墙，禁用 SWAP、SELINUX
[root@openGauss ~]# systemctl status firewalld● firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled) Active: active (running) since Fri 2020-07-10 00:04:36 CST; 1 day 20h ago Docs: man:firewalld(1)Main PID: 8889 (firewalld) Tasks: 2 CGroup: /system.slice/firewalld.service └─8889 /usr/bin/python -Es /usr/sbin/firewalld --nofork --nopidJul 10 00:04:34 openGauss systemd[1]: Starting firewalld - dynamic firewall daemon...Jul 10 00:04:36 openGauss systemd[1]: Started firewalld - dynamic firewall daemon.[root@openGauss ~]# systemctl stop firewalld [root@openGauss ~]# systemctl status firewalld● firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled) Active: inactive (dead) since Sat 2020-07-11 20:19:00 CST; 3s ago Docs: man:firewalld(1) Process: 8889 ExecStart=/usr/sbin/firewalld --nofork --nopid $FIREWALLD_ARGS (code=exited, status=0/SUCCESS)Main PID: 8889 (code=exited, status=0/SUCCESS)Jul 10 00:04:34 openGauss systemd[1]: Starting firewalld - dynamic firewall daemon...Jul 10 00:04:36 openGauss systemd[1]: Started firewalld - dynamic firewall daemon.Jul 11 20:18:58 openGauss systemd[1]: Stopping firewalld - dynamic firewall daemon...Jul 11 20:19:00 openGauss systemd[1]: Stopped firewalld - dynamic firewall daemon.[root@openGauss ~]# systemctl disable firewalldRemoved symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.###禁用swap[root@openGauss ~]# swapoff -a[root@openGauss ~]# swapoff -avswapoff /dev/mapper/centos_opengauss-swap###禁用 SELINUX[root@openGauss ~]# sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config[root@openGauss ~]# cat /etc/selinux/config | grep SELINUX# SELINUX= can take one of these three values:SELINUX=disabled# SELINUXTYPE= can take one of three values:SELINUXTYPE=targeted（6）设置网卡 MTU 值
MTU 默认 1500，也可以不用设置，保持默认即可，在前段时间中曾遇到在 Oracle 数据库中，因两节点 MTU 值不一致导致数据库和主机不断重启。https://mp.weixin.qq.com/s/vv44DIrDi2_Xzb6Xw_4UfA
MTU 是英文 Maximum Transmission Unit 的缩写，意为"最大传输单位"，也就是在连接的时候，所传输信息包最多可以有多少字节。我们必须找到不会返回 fragment (碎片)信息的最大 MTU。除了 ADSL PPPoE 的 MTU 是 1492 外，其余各种 DSL 的 MTU 标准设置都是 1500。MaxMTU 是最大的 TCP/IP 传输单元，在 TCP/IP 协议中，将要传输的数据分成较小的组进行传输，每个组的大小为 576 字节。
[root@openGauss ~]# ifconfig ens33 | grep mtuens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500[root@openGauss ~]# ifconfig ens33 mtu 8192[root@openGauss ~]# ifconfig ens33 | grep mtuens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 8192（7）了解安装用户及用户组
为了实现安装过程中安装帐户权限最小化，及安装后 openGauss 的系统运行安全性。安装脚本在安装过程中会自动按照用户指定创建安装用户，并将此用户作为后续运行和维护 openGauss 的管理员帐户。默认单独的用户组为 dbgrp，用户为 omm .
(8) 解压安装包
[root@openGauss ~]# cd /opt/openGauss[root@openGauss openGauss]# lltotal 60960-rw-r--r--. 1 root root 62419226 Jul 9 11:40 openGauss-1.0.0-CentOS-64bit.tar.gz[root@openGauss openGauss]# tar -zxvf openGauss-1.0.0-CentOS-64bit.tar.gz./lib/./lib/pyasn1/./lib/pyasn1/codec/./lib/pyasn1/codec/cer/./lib/pyasn1/codec/cer/__init__.py./lib/pyasn1/codec/cer/decoder.py./lib/pyasn1/codec/cer/encoder.py前面已经配置好网络，如下图也可以直接 wget 下载软件包。然后修改安装目录权限。
chmod -R 755 /opt/openGauss(9) 创建 XML 配置文件，执行预安装脚本 gs_preinstall
[root@openGauss openGauss]# pwd/opt/openGauss[root@openGauss openGauss]# vi clusterconfig.xml<?xml version="1.0" encoding="UTF-8"?><ROOT> <!-- 整体信息 --> <CLUSTER> <!-- 数据库名称 --> <PARAM name="clusterName" value="opengauss" /> <!-- 数据库节点名称(hostname) --> <PARAM name="nodeNames" value="openGauss" /> <!-- 节点IP，与nodeNames一一对应 --> <PARAM name="backIp1s" value="192.168.52.88"/> <!-- 数据库安装目录--> <PARAM name="gaussdbAppPath" value="/opt/gaussdb/install/app" /> <!-- 日志目录--> <PARAM name="gaussdbLogPath" value="/var/log/omm" /> <!-- 临时文件目录--> <PARAM name="tmpMppdbPath" value="/opt/gaussdb/tmp" /> <!--数据库工具目录--> <PARAM name="gaussdbToolPath" value="/opt/gaussdb/install/om" /> <!--数据库core文件目录--> <PARAM name="corePath" value="/opt/gaussdb/corefile"/> <!-- openGauss类型，此处示例为单机类型，“single-inst”表示单机一主多备部署形态--> <PARAM name="clusterType" value="single-inst"/> </CLUSTER> <!-- 每台服务器上的节点部署信息 --> <DEVICELIST> <!-- node1上的节点部署信息 --> <DEVICE sn="1000001"> <!-- node1的hostname --> <PARAM name="name" value="openGauss"/> <!-- node1所在的AZ及AZ优先级 --> <PARAM name="azName" value="AZ1"/> <PARAM name="azPriority" value="1"/> <!-- node1的IP，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="192.168.52.88"/> <PARAM name="sshIp1" value="192.168.52.88"/> <!--DBnode--> <PARAM name="dataNum" value="1"/> <!--DBnode端口号--> <PARAM name="dataPortBase" value="26000"/> <!--DBnode主节点上数据目录，及备机数据目录--> <PARAM name="dataNode1" value="/opt/gaussdb/install/data/db1"/> <!--DBnode节点上设定同步模式的节点数--> <!--><PARAM name="dataNode1_syncNum" value="0"/><--> </DEVICE> </DEVICELIST></ROOT>--具体详细的配置文件说明可查看官方文档配置文件说明。为确保 openssl 版本正确，执行预安装前请加载安装包中 lib 库。
export LD_LIBRARY_PATH=/opt/openGauss/script/gspylib/clib:$LD_LIBRARY_PATH注意：如果是 openEuler 的操作系统，需要修改 /etc/profile.d/performance.sh 文件使用#注释sysctl -w vm.min_free_kbytes=112640 &> /dev/nullgs_preinstall 为 Python 脚本，查看脚本内容为集群环境配置脚本 “environment for a cluster”，会设置 root 用户互信然后新建 omm 用户 dbgrp 组并配置互信，检查操作系统版本，创建路径，设置系统参数，配置环境变量 /etc/profile 以及 omm 用户的 .bashrc 环境变量 等等。
使用 gs_preinstall 的目的就是准备好安装环境，类似于 Oracle 的 *preinstall-19c*.rpm 包 。这里采用交互模式执行前置，并在执行过程中自动创建 root 用户互信和 openGauss 用户互信等一些信息，详细内容请看如下执行过程。
./gs_preinstall -U omm -G dbgrp -X /opt/openGauss/clusterconfig.xml[root@openGauss etc]# cd /opt/openGauss/script/[root@openGauss script]# ./gs_preinstall -U omm -G dbgrp -X /opt/openGauss/clusterconfig.xmlParsing the configuration file.Successfully parsed the configuration file.Installing the tools on the local node.Successfully installed the tools on the local node.Are you sure you want to create trust for root (yes/no)? yesPlease enter password for root.Password: --输入 root 密码开始配置互信Creating SSH trust for the root permission user.Checking network information.All nodes in the network are Normal.Successfully checked network information.Creating SSH trust.Creating the local key file.Successfully created the local key files.Appending local ID to authorized_keys.Successfully appended local ID to authorized_keys.Updating the known_hosts file.Successfully updated the known_hosts file.Appending authorized_key on the remote node.Successfully appended authorized_key on all remote node.Checking common authentication file content.Successfully checked common authentication content.Distributing SSH trust file to all node.Successfully distributed SSH trust file to all node.Verifying SSH trust on all hosts.Successfully verified SSH trust on all hosts.Successfully created SSH trust.Successfully created SSH trust for the root permission user.Setting pssh pathSuccessfully set core path.Distributing package.Begin to distribute package to tool path.Successfully distribute package to tool path.Begin to distribute package to package path.Successfully distribute package to package path.Successfully distributed package. --创建 omm 用户，这里需要两次输入密码 openGauss_1 然后开始配置互信Are you sure you want to create the user[omm] and create trust for it (yes/no)? yesPlease enter password for cluster user.Password:Please enter password for cluster user again.Password:Successfully created [omm] user on all nodes.Preparing SSH service.Successfully prepared SSH service.Installing the tools in the cluster.Successfully installed the tools in the cluster.Checking hostname mapping.Successfully checked hostname mapping.Creating SSH trust for [omm] user.Checking network information.All nodes in the network are Normal.Successfully checked network information.Creating SSH trust.Creating the local key file.Successfully created the local key files.Appending local ID to authorized_keys.Successfully appended local ID to authorized_keys.Updating the known_hosts file.Successfully updated the known_hosts file.Appending authorized_key on the remote node.Successfully appended authorized_key on all remote node.Checking common authentication file content.Successfully checked common authentication content.Distributing SSH trust file to all node.Successfully distributed SSH trust file to all node.Verifying SSH trust on all hosts.Successfully verified SSH trust on all hosts.Successfully created SSH trust.Successfully created SSH trust for [omm] user.############--->检查操作系统版本，创建路径，设置系统参数Checking OS software.Successfully check os software.Checking OS version.Successfully checked OS version.Creating cluster's path.Successfully created cluster's path.Setting SCTP service.Successfully set SCTP service.Set and check OS parameter.Setting OS parameters.Successfully set OS parameters.[GAUSS-51400] : Failed to execute the command: python3 '/opt/openGauss/script/gs_checkos' -h openGauss -i A -l '/var/log/omm/omm/om/gs_local.log' -X '/opt/openGauss/clusterconfig.xml'.Error:Checking items: A1. [ OS version status ] : Normal A2. [ Kernel version status ] : Normal A3. [ Unicode status ] : Normal A4. [ Time zone status ] : Normal A5. [ Swap memory status ] : Normal A6. [ System control parameters status ] : Warning A7. [ File system configuration status ] : Warning A8. [ Disk configuration status ] : Normal A9. [ Pre-read block size status ] : Normal A10.[ IO scheduler status ] : Normal[openGauss]:[GAUSS-51632] : Failed to do python3 '/opt/openGauss/script/local/LocalCheckOS.py' -t Check_Network_Bond_Mode -X '/opt/openGauss/clusterconfig.xml' -l '/var/log/omm/omm/om/gs_local.log'. Error:[GAUSS-50604] : Failed to obtain network interface card of backIp(192.168.52.88). Error:[GAUSS-50604] : Failed to obtain network interface card of backIp(192.168.52.88)..这里网络方面出现的错误是由于前面配置网络 yum 源将 ens33 的网卡设置成 dhcp 自动获取，IP 地址自动变成 192.168.52.28 所导致 ，现将其修改为 “none”后重启网卡，重新执行此脚本即可。
[root@openGauss opt]# ifconfigens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 8192 inet 192.168.52.28 netmask 255.255.255.0 broadcast 192.168.52.255[root@openGauss network-scripts]# cd /etc/sysconfig/network-scripts[root@openGauss network-scripts]# more ifcfg-ens33 | grep nonePROXY_METHOD="none"BOOTPROTO="none"[root@openGauss network-scripts]# service network restartRestarting network (via systemctl): [ OK ][root@openGauss network-scripts]#[root@openGauss network-scripts]#[root@openGauss network-scripts]# ifconfigens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 8192 inet 192.168.52.88 netmask 255.255.255.0 broadcast 192.168.52.255--------------------------------------------------------------------------------[root@openGauss script]# pwd/opt/openGauss/script[root@openGauss script]# ./gs_preinstall -U omm -G dbgrp -X /opt/openGauss/clusterconfig.xmlParsing the configuration file.Successfully parsed the configuration file.Installing the tools on the local node.Successfully installed the tools on the local node.Are you sure you want to create trust for root (yes/no)? yesPlease enter password for root.Password:Creating SSH trust for the root permission user.Checking network information.All nodes in the network are Normal.Successfully checked network information.Creating SSH trust.Creating the local key file.Successfully created the local key files.Appending local ID to authorized_keys.Successfully appended local ID to authorized_keys.Updating the known_hosts file.Successfully updated the known_hosts file.Appending authorized_key on the remote node.Successfully appended authorized_key on all remote node.Checking common authentication file content.Successfully checked common authentication content.Distributing SSH trust file to all node.Successfully distributed SSH trust file to all node.Verifying SSH trust on all hosts.Successfully verified SSH trust on all hosts.Successfully created SSH trust.Successfully created SSH trust for the root permission user.Setting pssh pathSuccessfully set core path.Distributing package.Begin to distribute package to tool path.Successfully distribute package to tool path.Begin to distribute package to package path.Successfully distribute package to package path.Successfully distributed package.Are you sure you want to create the user[omm] and create trust for it (yes/no)? yesPreparing SSH service.Successfully prepared SSH service.Installing the tools in the cluster.Successfully installed the tools in the cluster.Checking hostname mapping.Successfully checked hostname mapping.Creating SSH trust for [omm] user.Please enter password for current user[omm].Password:Checking network information.All nodes in the network are Normal.Successfully checked network information.Creating SSH trust.Creating the local key file.Successfully created the local key files.Appending local ID to authorized_keys.Successfully appended local ID to authorized_keys.Updating the known_hosts file.Successfully updated the known_hosts file.Appending authorized_key on the remote node.Successfully appended authorized_key on all remote node.Checking common authentication file content.Successfully checked common authentication content.Distributing SSH trust file to all node.Successfully distributed SSH trust file to all node.Verifying SSH trust on all hosts.Successfully verified SSH trust on all hosts.Successfully created SSH trust.Successfully created SSH trust for [omm] user.Checking OS software.Successfully check os software.Checking OS version.Successfully checked OS version.Creating cluster's path.Successfully created cluster's path.Setting SCTP service.Successfully set SCTP service.Set and check OS parameter.Setting OS parameters.Successfully set OS parameters.Warning: Installation environment contains some warning messages.Please get more details by "/opt/openGauss/script/gs_checkos -i A -h openGauss --detail".Set and check OS parameter completed.Preparing CRON service.Successfully prepared CRON service.Setting user environmental variables.Successfully set user environmental variables.Setting the dynamic link library.Successfully set the dynamic link library.Setting Core fileSuccessfully set core path.Setting pssh pathSuccessfully set pssh path.Set ARM Optimization.No need to set ARM Optimization.Fixing server package owner.Setting finish flag.Successfully set finish flag.Preinstallation succeeded.官方安装文档：
https://opengauss.org/zh/docs/1.0.0/docs/installation/%E5%AE%89%E8%A3%85openGauss.html
三、检查健康状态
通过 openGauss 提供的 gs_checkos 工具可以完成系统状态检查。
◾ 以 root 用户身份登录。
◾ 执行如下命令对 openGauss 节点服务器的 OS 参数进行检查。
[root@openGauss opt]# gs_checkos -i AChecking items: A1. [ OS version status ] : Normal A2. [ Kernel version status ] : Normal A3. [ Unicode status ] : Normal A4. [ Time zone status ] : Normal A5. [ Swap memory status ] : Normal A6. [ System control parameters status ] : Warning A7. [ File system configuration status ] : Warning A8. [ Disk configuration status ] : Normal A9. [ Pre-read block size status ] : Normal A10.[ IO scheduler status ] : Normal A11.[ Network card configuration status ] : Normal A12.[ Time consistency status ] : Warning A13.[ Firewall service status ] : Normal A14.[ THP service status ] : NormalTotal numbers:14. Abnormal numbers:0. Warning numbers:3.----h 主机名查看详细信息[root@openGauss db1]# /opt/openGauss/script/gs_checkos -i A -h openGauss --detailChecking items: A1. [ OS version status ] : Normal [openGauss] centos_7.6.1810_64bit
A2. [ Kernel version status ] : Normal The names about all kernel versions are same. The value is "3.10.0-957.el7.x86_64". A3. [ Unicode status ] : Normal The values of all unicode are same. The value is "LANG=en_US.UTF-8". A4. [ Time zone status ] : Normal The informations about all timezones are same. The value is "+0800". A5. [ Swap memory status ] : Normal The value about swap memory is correct. A6. [ System control parameters status ] : Warning [openGauss] Warning reason: variable 'net.ipv4.tcp_retries1' RealValue '3' ExpectedValue '5'. Warning reason: variable 'net.ipv4.tcp_syn_retries' RealValue '6' ExpectedValue '5'. Warning reason: variable 'net.sctp.path_max_retrans' RealValue '5' ExpectedValue '10'. Warning reason: variable 'net.sctp.max_init_retransmits' RealValue '8' ExpectedValue '10'. Check_SysCtl_Parameter warning. A7. [ File system configuration status ] : Warning [openGauss] Warning reason: variable 'open files' RealValue '1024' ExpectedValue '1000000' Warning reason: variable 'max user processes' RealValue '14950' ExpectedValue 'unlimited' A8. [ Disk configuration status ] : Normal The value about XFS mount parameters is correct. A9. [ Pre-read block size status ] : Normal The value about Logical block size is correct. A10.[ IO scheduler status ] : Normal The value of IO scheduler is correct. A11.[ Network card configuration status ] : Normal The configuration about network card is correct. A12.[ Time consistency status ] : Warning [openGauss] The NTPD not detected on machine and local time is "2020-07-12 11:05:21". A13.[ Firewall service status ] : Normal The firewall service is stopped. A14.[ THP service status ] : Normal The THP service is stopped. Total numbers:14. Abnormal numbers:0. Warning numbers:3.以上检查要是没有任何问题，就可以继续安装了。不过，以下的安装步骤放到下篇文章在继续吧，文章太长不易阅读，本次就先到这里了。写作不易，此文如果对你有帮助，请支持“在看”与转发，您的支持便是我不断写作的最大的动力，加油，让我们一起努力做更好的自己！
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