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Settings_Linux

Useful bash scripts and settings for managing a Linux server

Instructions on how to update the server IP address

Last updated 2020-10-06 by Adam Lu

Suppose the IP address for fishfish changed from 128.143.15.11 to 172.28.76.139

Update MobaXTerm settings for each Windows computer
- Right click on the saved session called fishfish, and hit Edit session.
- Change the value of the field Remote host to the new IP: 172.28.76.139.
Update VNC Viewer settings for each Windows computer
- Right click on each saved session for the server of interest such as fishfish-6, and hit Properties.
- Change the value of the field VNC Server to the new IP with the session number, for example, change 128.143.15.11:6 to 172.28.76.139:6, where 6 is the session number.
Update mapped drives for each Windows computer
- Open a Windows Explorer to Computer.
- Unlink any mapped drives to 128.143.15.11 and delete any network locations from 128.143.15.11 .
- Right click and hit Add A Network Location and enter \\172.28.76.139\shareX as the address.

Update bash scripts, instructions notes and URL files on the server

Open a terminal to the location ~/Settings_Linux.

Enter the following command:

## Replace the IP address in all files recursively
#	Note: This is a function in ~/Settings_Linux/scripts/adams_commands.sh
#	USAGE: replace_in_all_files [oldStr] [newStr] [dirsOrFiles (opt)]
replace_in_all_files 128.143.15.11 172.28.76.139

and hit y to accept changes

Enter the following command to update scripts to /usr/local/bin (to make them accessible from any location):
```
## Note: This is a script in ~/Settings_Linux/scripts/
bash setup_binfiles.sh
```

Update the Settings_Linux git repository:

## Note: This is a script in ~/Settings_Linux/scripts/
bash git_update.sh

Update the ufw firewall for the other server
- Open a terminal on the other server (chalkboard in this case).
- Enter the following command to view the current list of IPs blocked by the ufw firewall:
```
## This is an alias for 'sudo ufw status numbered'
ufwall
```
- Locate the entry numbers for the old server IP (128.143.15.11 in this case).
- Suppose the entry numbers are 47-49, then remove entry 47 a total of 3 times:
```
## Note that after deleting entry #47, the following entries are shifted up by one, so entry #48 will become entry #47
sudo ufw delete 47
sudo ufw delete 47
sudo ufw delete 47
```
- Add the new server IP (172.28.76.139 in this case).
```
##	Note: This is a function in ~/Settings_Linux/scripts/adams_commands.sh
#	USAGE: add_IP [IPv4 address] [port number (opt)]
#	By default, the port numbers added are 22, 445 and 5900:5920
add_IP 172.28.76.139
```
- Check the updated list of IPs blocked by the ufw firewall:
```
## This is an alias for 'sudo ufw status numbered'
ufwall
```
- Make sure the list of IPs for the chalkboard firewall on the website is updated as well.
Establish a new host key on the other server
- Open a terminal on the other server (chalkboard in this case).
- Login to the server (fishfish in this case)
```
## This is an alias for ssh -Y ${USER}@172.28.76.139
sshfishfish
```