Centos 8 notes

Using Centos 8 notes

Download and install ‘BitVise Windows SSH Client’

• New SFTP window for drag and drop upload / download / Erase / Rename
• New terminal console for cmd access.

Note: Linux is CASE SENSITIVE, file.txt and File.txt are can be two separate files.

General

• cd - To navigate folder structure eg. cd /nas/nopCommerce-test
• ls - To list files / folders in directory
• ls -la - To list files / folders with information of who owns the files and byte size and timestamp
• pwd - To display current path
• exit - Ends terminal session

Ownership

• sudo chown www-data:www-data fileName - Change ownership of files in fileName to belong to www-data

  NOTE: When files are uploaded using the drag and drop (scp) files are written using your account. For Kestrel to be able to run / access then, the ownership needs to be changed to the account which kestrel runs under www-data

Start / Stop / Status of running daemon process

• sudo systemctl start _servicenamehere_.service - This command starts the daemon service called _servicenamehere_.service Starts the kestrel instance daemon process
• sudo systemctl stop _servicenamehere_.service - This command stops the daemon service called _servicenamehere_.service

• sudo journalctl -fu _servicenamehere_ - Tails the STDOUT / STDERR from the service called _servicenamehere_

  CTRL-C to end console output.

Miscellaneous

• du -cha --max-depth=1 / | grep -E "M|G" - To find out where disk space is being used from root directory folder
• du -cha --max-depth=1 /var/nginx | grep -E "M|G" - To find out where disk space is being used from /var/nginx directory folder

Periodic maintenance

• sudo yum update answer y when prompted
• sudo yum upgrade answer y when prompted

Important directories

/etc/systemd/system - Contains the service daemon files which run the applications and restart the apps on crash