-bash: ssh: command not found 

解决方法：

命令安装SSH：

 yum -y install openssh-clients

 具体命令如下：

[root@node01 .ssh]# ssh node01
-bash: ssh: command not found
[root@node01 .ssh]# rpm -qa | grep openssh
openssh-5.3p1-111.el6.i686
openssh-server-5.3p1-111.el6.i686
[root@node01 .ssh]# yum -y install openssh-clients
Loaded plugins: fastestmirror
Setting up Install Process
Loading mirror speeds from cached hostfile

验证ssh是否可用

Dependency Updated:
  openssh.i686 0:5.3p1-124.el6_10                             openssh-server.i686 0:5.3p1-124.el6_10                            

Complete!
[root@node01 .ssh]# ssh node01
The authenticity of host 'node01 (192.168.136.111)' can't be established.
RSA key fingerprint is 4b:88:17:42:f5:2b:dc:47:76:c0:1b:f9:5f:2f:0b:c1.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'node01,192.168.136.111' (RSA) to the list of known hosts.
Last login: Fri Mar 13 23:38:46 2020 from 192.168.136.1
[root@node01 ~]# 

完毕~~~