exec command error when I ignore output

[lalor]

I use paramaiko to exec some command in remote VM.

There is something wrong when I ignore output of exec_command, when I fetch out the result of exec_command, It' will be right. Is there has some bugs ?

the right code:

def upgrade_agent(ssh, agent):                                                          
    """upgrade agent"""                                                                 

    target_alias = "NewAgent"                                                           
    with ssh.open_sftp() as sftp:                                                                                                                     
        sftp.put(agent, agent)                                                          

        cmds = ["tar -zxf {0}".format(agent),                                           
                "rm {0}".format(agent),                                                 
                "[ -e AgentBackup ] && rm -rf AgentBackup",                             
                "mv  rdsAgent AgentBackup",                                             
                "mv {0} rdsAgent".format(target_alias),                                 
                "cp AgentBackup/config/RDSAgent.cnf rdsAgent/config/RDSAgent.cnf",   
                "cat ~/log/agent.pid  | xargs kill -9",                                 
                "~rds-user/rdsAgent/agent_safe"]                                        

        for cmd in cmds:                                                                
            _, stdout, _ = ssh.exec_command(cmd)                                        
            a = stdout.readlines() 

the wrong code

        for cmd in cmds:                                                                
            ssh.exec_command(cmd)                                        

[lalor]

I think that this problem is some with #550

[bitprophet]

Yea, this sounds likely to be the same as #550 - thanks!