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→PART 2: running privileged commands on remote machines
== PART 2: running privileged commands on remote machines ==
: <font color='red'><b>**WARNING** Run privileged commands incorrectly with sudo may cause irreparable damage to your remote machine.</b></font>
: We say that running an ad-hoc fab command is very similar to the SSH command with shell commands attached at the end. Let's try both with privileged commands, like the "yum" command.
fab --host=myvmlab.senecacollege.ca --port=7200 --user=student -- 'sudo yum install tree -y'
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: Type in your user student's password when prompted for "sudo password", the '''yum install ''' command to should be executed successfully and install the '''tree ''' rpm package should be executed successfully. If the tree rpm package is already installed, you can remove it with the following ad-hoc fab command: <source lang='bash'>
fab --host=myvmlab.senecacollege.ca --port=7200 --user=student -- 'sudo yum remove tree -y'
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= INVESTIGATION 3: Running the fab command in script mode =
= Lab Exercise: Create a Fabric task called makeUser() =
: Study the Fabric API run(), sudo(), local(), and put() and utilize them to create a new Fabric task called makeUser()
: The makeUser() task should perform the following on a remote machine to:
:* create a new user called "ops435p" with home directory "/home/ops435p".
:* add the new user to the sudo group called "wheel".
:* from your instructor, get the ssh public key which is posted on the internet to your controller workstation.:* add the ssh public key obtained from your instructor to the file named "authorized_keys" in the ~ops435p/.ssh directoryon the remote machine. (Note: Make sure that you set the proper ownership and permissions on both the directory ~ops435p/.ssh and the file "~ops435p/.ssh/authorized_keys.)
:Add the makeUser() to your final version of fabfile.py.
:Run the new task makeUser() on your VM.
