In this lab, we’ll go over I/O redirection, file permissions, and using the `ssh` tool. These are skills that will serve you well in your career as a Linux sysadmin. Once complete, you’ll have a solid understanding of how to use these tools.
*This course is not approved or sponsored by Red Hat.*
Learning Objectives
Successfully complete this lab by achieving the following learning objectives:
- Enable SSH to Connect Without a Password from the `dev` User on `server1` to the `dev` User on `server2`
We need to use SSH keys to satisfy this requirement, so generate them with this:
[dev@server1]$ ssh-keygenThen run:
[dev@server1]$ ssh-copy-id <server2 IP>- Copy All tar Files from `/home/dev/` on `server1` to `/home/dev/` on `server2`, Extract Them, and Redirect Output to `/home/dev/tar-output.log`
We need to use a method of copying files over a network.
scpis the best tool, like this:[dev@server1]$ scp *.gz <server2 IP>:~/Then connect to
server2usingssh:[dev@server1]$ ssh <server2_IP>Then we can extract the files:
[dev@server2]$ tar -xvf deploy_content.tar.gz >> tar-output.log[dev@server2]$ tar -xvf deploy_script.tar.gz >> tar-output.logMake sure to use
>>, so that the output is appended rather than overwritten.- Set the Umask So That New Files Are Only Readable and Writeable by the Owner
The task is asking to make new files with the following permission:
0600.So we can do subtraction to figure out what our umask should be.
0666<– Default0600<– Desired----0066<– What we need to setSo we run:
[dev@server2]$ umask 0066- Verify the `/home/dev/deploy.sh` Script Is Executable and Run It
First, we check permissions on
deploy.sh:[dev@server2]$ ls -l deploy.shThere’s no execute bit. Let’s add one:
[dev@server2]$ chmod +x deploy.shAnd then run it:
[dev@server2]$ ./deploy.sh
