[yz@test ~]$ cd /opt/openGauss/openGauss-server/mppdb_temp_install/bin
[yz@test bin]$ ./gs_ctl start -D /opt/openGauss/gauss_data -Z single_node -l logfile
[yz@test bin]$ ./gsql postgres
gsql ((openGauss 2.0.0 build 5af8c3d0) compiled at 2021-04-12 14:45:44 commit 0 last mr  debug)
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

postgres=#