How to run two sudo commands subsequently in python paramiko -SSH client linux?

Question

I am trying to do a ssh to my local machine - 127.0.0.1, which works fine. Next, I am trying to run two commands through ssh client. However, I see that the next command fails. I could see that my tap device is created. However, the tap device is not turned up. Here is my code. I tried the ifconfig and it works fine. However, it is the sudo commands that is creating a problem.

self.serverName is 127.0.0.1

  def configure_tap_iface(self):
        ssh = paramiko.SSHClient()
        print('SSH on to PC')
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        ssh.connect(self.serverName, username='zebra', password='Zebra@2018')
        stdin, stdout, stderr = ssh.exec_command('ifconfig')
        #print(stdout.read())
        session = ssh.get_transport().open_session()
        session.get_pty()
        session.exec_command('sudo ip address add 192.168.0.1/24 dev cloud_tap && sudo ip link set cloud_tap up')
        session.close()
        time.sleep(3)
        ssh.close()

If you do the same with some simple commands (not sudo), does it work? — Martin Prikryl
– Martin Prikryl, Commented Aug 22, 2018 at 5:48
Is your account configured to run sudo passwordless? Can you run sudo -l from Paramiko, what does it display? — tripleee
– tripleee, Commented Aug 22, 2018 at 10:29
env_reset, mail_badpass, secure_path=/usr/local/sbin\\:/usr/local/bin\\:/usr/sbin\\:/usr/bin\\:/sbin\\:/bin\\:/snap/bin\n\nUser bali may run the following commands on pc-ubu:\n (root) NOPASSWD: /sbin/ip\n (ALL : ALL) ALL\n' — Bali Vinayak
– Bali Vinayak, Commented Aug 22, 2018 at 10:49

tripleee · Accepted Answer · 2018-08-22 06:40:45Z

1

You can use sudo sh -c 'commands' to run multiple shell commands in a single sudo invocation.

session.exec_command("sudo sh -c 'ip address add 192.168.0.1/24 dev cloud_tap && ip link set cloud_tap up'")

answered Aug 22, 2018 at 6:40

tripleee

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2 Comments

Bali Vinayak Over a year ago

what does sh -c means? is sh for shell ? how about -c switch?

tripleee Over a year ago

sh -c 'commands; more commands' says to read the script from the command line instead of from a script file. Yes, sh is the standard Bourne shell which is generally used for noninteractive scripts even if you have a different interactive shell.

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