上一篇文章记录了GreenPlum数据库的Master在非Mirror模式的安装过程(详见GreenPlum数据库安装系列第一篇：非mirror模式Master软件安装),本文简要记录NO Mirror模式GreenPlum的Segment节点软件安装过程，不涉及数据库初始化内容。本实验操作系统为OEL 6.5，GPDB版本为4.3.6.2。

1.系统设置

1.1编辑节点信息文件(仅Master节点)

为了管理方便，在app目录下创建config文件夹，将节点信息文件存放在该目录下。需要创建两个文件，其中一个文件(hostlist)存放所有节点信息，seg_host文件只存放segment节点信息。

[gpadmin@mdw app]$ mkdir config
[gpadmin@mdw app]$ cd config/
[gpadmin@mdw config]$ vi hostlist

mdw
sdw1
sdw2
sdw3
[gpadmin@mdw config]$ vi seg_host

sdw1
sdw2
sdw3

1.2打通所有节点直接的互信(仅Master节点)

GreenPlum数据库提供gpssh-exkeys工具来打开所有节点直接的互信关系，非常方便。

[gpadmin@mdw config]$ gpssh-exkeys -f hostlist
[STEP 1 of 5] create local ID and authorize on local host
  ... /home/gpadmin/.ssh/id_rsa file exists ... key generation skipped

[STEP 2 of 5] keyscan all hosts and update known_hosts file

[STEP 3 of 5] authorize current user on remote hosts
  ... send to sdw1
  ***
  *** Enter password for sdw1: --此处需要输入sdw1节点的gpadmin用户的密码，如果所有节点密码一致，输入一次即可。
  ... send to sdw2
  ... send to sdw3

[STEP 4 of 5] determine common authentication file content

[STEP 5 of 5] copy authentication files to all remote hosts
  ... finished key exchange with sdw1
  ... finished key exchange with sdw2
  ... finished key exchange with sdw3

[INFO] completed successfully

互信配置完成后，可以通过gpssh工具来验证互信是否成功配置，-e参数后面的是远程登录节点后执行的命令。通过gpssh工具可以在所有节点运行同一命令，非常方便(后续会用到)。

[gpadmin@mdw config]$ gpssh -f hostlist -e pwd
[sdw2] pwd
[sdw2] /home/gpadmin
[sdw1] pwd
[sdw1] /home/gpadmin
[ mdw] pwd
[ mdw] /home/gpadmin
[sdw3] pwd
[sdw3] /home/gpadmin

2.Segment节点安装GreenPlum软件(仅Master节点)

通过gpseginstall命令安装segment软件，使用-u参数指定安装用户，-p参数指定安装用户的密码，这样将不再需要交互式输入密码。

[gpadmin@mdw config]$ gpseginstall -f hostlist -u gpadmin -p padmin
20160113:09:58:32:025688 gpseginstall:mdw:gpadmin-[INFO]:-Installation Info:
link_name greenplum-db
binary_path /gpdb/app
binary_dir_location /gpdb
binary_dir_name app
20160113:09:58:32:025688 gpseginstall:mdw:gpadmin-[INFO]:-check cluster password access
20160113:09:58:33:025688 gpseginstall:mdw:gpadmin-[INFO]:-de-duplicate hostnames
20160113:09:58:33:025688 gpseginstall:mdw:gpadmin-[INFO]:-master hostname: mdw
20160113:09:58:34:025688 gpseginstall:mdw:gpadmin-[INFO]:-rm -f /gpdb/app.tar; rm -f /gpdb/app.tar.gz
20160113:09:58:34:025688 gpseginstall:mdw:gpadmin-[INFO]:-cd /gpdb; tar cf app.tar app
20160113:09:58:35:025688 gpseginstall:mdw:gpadmin-[INFO]:-gzip /gpdb/app.tar
20160113:09:58:55:025688 gpseginstall:mdw:gpadmin-[INFO]:-remote command: mkdir -p /gpdb
20160113:09:58:56:025688 gpseginstall:mdw:gpadmin-[INFO]:-remote command: rm -rf /gpdb/app
20160113:09:58:56:025688 gpseginstall:mdw:gpadmin-[INFO]:-scp software to remote location
20160113:09:58:58:025688 gpseginstall:mdw:gpadmin-[INFO]:-remote command: gzip -f -d /gpdb/app.tar.gz
20160113:09:59:06:025688 gpseginstall:mdw:gpadmin-[INFO]:-md5 check on remote location
20160113:09:59:07:025688 gpseginstall:mdw:gpadmin-[INFO]:-remote command: cd /gpdb; tar xf app.tar
20160113:09:59:12:025688 gpseginstall:mdw:gpadmin-[INFO]:-remote command: rm -f /gpdb/app.tar
20160113:09:59:26:025688 gpseginstall:mdw:gpadmin-[INFO]:-remote command: cd /gpdb; rm -f greenplum-db; ln -fs app greenplum-db
20160113:09:59:27:025688 gpseginstall:mdw:gpadmin-[INFO]:-rm -f /gpdb/app.tar.gz
20160113:09:59:27:025688 gpseginstall:mdw:gpadmin-[INFO]:-version string on master: gpssh version 4.3.6.2 build 1
20160113:09:59:27:025688 gpseginstall:mdw:gpadmin-[INFO]:-remote command: . /gpdb/greenplum-db/./greenplum_path.sh; /gpdb/greenplum- 
db/./bin/gpssh --version
20160113:09:59:27:025688 gpseginstall:mdw:gpadmin-[INFO]:-remote command: . /gpdb/app/greenplum_path.sh; /gpdb/app/bin/gpssh --version
20160113:09:59:33:025688 gpseginstall:mdw:gpadmin-[INFO]:-SUCCESS -- Requested commands completed

Segment节点会根据Master节点的安装路径安装GreenPlum软件，目录结构和Master一模一样。

3.Segment节点配置环境变量(所有Segment节点)

[gpadmin@sdw1 app]$ vi /home/gpadmin/.bash_profile 

# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
        . ~/.bashrc
fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin

export PATH
source /gpdb/app/greenplum_path.sh

通过下面的命令使之生效。

[gpadmin@sdw1 app]$ . /home/gpadmin/.bash_profile

至此Segment节点的GreenPlum软件安装完成。

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