How do I go inside a docker container and restart a service in Python using Paramiko module?

Question

This is my piece of code that I am trying to use to restart a service but I am not able to. I am using python's paramiko module to restart a service by going into the container of the service.

def sshOpensips(ip):
        warnings.filterwarnings(action='ignore',module='.*paramiko.*')
        client = pm.SSHClient()
        commands = ["docker exec -it opensips bash", "service opensips restart"]
        client.set_missing_host_key_policy(pm.AutoAddPolicy())
        pk = pm.RSAKey.from_private_key(open('/home/asad.javed/.ssh/y'))
        try:
                client.connect(ip, username='asad.javed', pkey=pk)
                print("Connection Established")
        except pm.SSHException:
                print("Connection Failed")
        for command in commands:
                stdin, stdout, stderr = client.exec_command(command);
        client.close()
        return True

Can someone please guide how can I restart a service by going into a docker container?

Answer 1

So the solution to my above problem was:

def sshOpensips(ip):
        warnings.filterwarnings(action='ignore',module='.*paramiko.*')
        command = ('docker exec opensips /bin/bash -c \"systemctl restart opensips\" && echo Opensips has restarted')
        client = pm.SSHClient()
        client.set_missing_host_key_policy(pm.AutoAddPolicy())
        pk = pm.RSAKey.from_private_key(open('/root/.ssh/id_rsa'))
        try:
                client.connect(ip, username='asad.javed', pkey=pk)
        except pm.SSHException:
                print("Connection Failed")
        session = client.get_transport().open_session()
        session.set_combine_stderr(True)
        session.get_pty()
        session.exec_command(command)
        stdin = session.makefile('wb', -1)
        stdout = session.makefile('rb', -1)
        kr.get_password("Opensips", "asad.javed")
        time.sleep(2)
        print(stdout.read().decode("utf-8"))
        for line in stdout.readlines():
                print(line.strip());

        exit_status = stdout.channel.recv_exit_status()

        if exit_status == 0:
                print("Command Executed")
        else:
                print("Error", exit_status)

        session.close()
        client.close()

For anyone who faces a similar issue in the future can use this solution to execute command in docker container. Two modules would be required for this Paramiko and Keyring.