在配置好GreenPlum过程中，需要注意一下几点：
- 找好安装包
- 安装依赖，Gun版本需要注意
- 详细安装步骤参考Greenplum安装介绍
自己是电脑虚拟机安装的中间出现很多报错，度娘加经验解决。最后启动还是报错，发现是资源不足，所以关闭了mirror，减少了segment。然后启动还是报错：
> > 20190122:20:23:14:003437 gpstart:mpp01:gpadmin-[INFO]:-Commencing parallel segment instance
> startup, please wait...
> ...
> 20190122:20:23:17:003437 gpstart:mpp01:gpadmin-[INFO]:-Process results...
> 20190122:20:23:17:003437 gpstart:mpp01:gpadmin-[INFO]:-----------------------------------------------------
> 20190122:20:23:17:003437 gpstart:mpp01:gpadmin-[INFO]:- Successful segment starts =
> 3
> 20190122:20:23:17:003437 gpstart:mpp01:gpadmin-[INFO]:- Failed segment starts = 0
> 20190122:20:23:17:003437 gpstart:mpp01:gpadmin-[INFO]:- Skipped segment starts (segments are marked down in configuration) = 0
> 20190122:20:23:17:003437 gpstart:mpp01:gpadmin-[INFO]:-----------------------------------------------------
> 20190122:20:23:17:003437 gpstart:mpp01:gpadmin-[INFO]:-Successfully started 3 of 3 segment
> instances
> 20190122:20:23:17:003437 gpstart:mpp01:gpadmin-[INFO]:-----------------------------------------------------
> 20190122:20:23:17:003437 gpstart:mpp01:gpadmin-[INFO]:-Starting Master instance mpp01 directory /opt/greenplum/data/master/gpseg-1
> 20190122:20:23:18:003437 gpstart:mpp01:gpadmin-[INFO]:-Command pg_ctl reports Master mpp01 instance active
> 20190122:20:23:19:003437 gpstart:mpp01:gpadmin-[WARNING]:-FATAL: DTM initialization: failure during startup recovery, retry failed,
> check segment status (cdbtm.c:1517)
> 20190122:20:23:19:003437 gpstart:mpp01:gpadmin-[INFO]:-No standby master configured. skipping...
> 20190122:20:23:19:003437 gpstart:mpp01:gpadmin-[INFO]:-Check status of database with gpstate utility
查看日志没有找到什么原因，后台度娘发现了，原来是防火墙没有关闭。那么就来关闭防火墙：
/etc/init.d/iptables stop
[root@mpp03 ~]# /etc/init.d/iptables stop
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules: [ OK ]
在3台机器上都关闭防火墙操作，然后启动
gpstart
20190122:20:28:01:004200 gpstart:mpp01:gpadmin-[INFO]:-Process results...
20190122:20:28:01:004200 gpstart:mpp01:gpadmin-[INFO]:-----------------------------------------------------
20190122:20:28:01:004200 gpstart:mpp01:gpadmin-[INFO]:- Successful segment starts = 3
20190122:20:28:01:004200 gpstart:mpp01:gpadmin-[INFO]:- Failed segment starts = 0
20190122:20:28:01:004200 gpstart:mpp01:gpadmin-[INFO]:- Skipped segment starts (segments are marked down in configuration) = 0
20190122:20:28:01:004200 gpstart:mpp01:gpadmin-[INFO]:-----------------------------------------------------
20190122:20:28:01:004200 gpstart:mpp01:gpadmin-[INFO]:-Successfully started 3 of 3 segment instances
20190122:20:28:01:004200 gpstart:mpp01:gpadmin-[INFO]:-----------------------------------------------------
20190122:20:28:01:004200 gpstart:mpp01:gpadmin-[INFO]:-Starting Master instance mpp01 directory /opt/greenplum/data/master/gpseg-1
20190122:20:28:02:004200 gpstart:mpp01:gpadmin-[INFO]:-Command pg_ctl reports Master mpp01 instance active
20190122:20:28:02:004200 gpstart:mpp01:gpadmin-[INFO]:-No standby master configured. skipping...
20190122:20:28:02:004200 gpstart:mpp01:gpadmin-[INFO]:-Database successfully started
启动成功！
psql
[gpadmin@mpp01 ~]$ psql
psql (8.3.23)
Type "help" for help.
gp_sydb=# 启动成功了，开始下面的学习吧