Create a service user without login on Slackware

1. Goal

Isolate application processes with dedicated accounts without interactive shells or unnecessary privileges.

2. Files and components involved

/etc/passwd
/etc/group
/sbin/nologin
/srv/app

3. Operational flow

groupadd appsvc
useradd -r -g appsvc -d /srv/app -s /sbin/nologin appsvc
mkdir -p /srv/app
chown -R appsvc:appsvc /srv/app

4. Operational verification

getent passwd appsvc
ls -ld /srv/app
ps -o user,group,cmd -u appsvc

5. Practical notes

Document every persistent change and keep a copy of the original files, especially when working on remote servers.

Operational procedures matter as much as commands: if they are not repeatable and documented, you will waste time on the next intervention.

Quick checklist

[ ] Backup or copy of the existing configuration completed
[ ] Files and commands updated as expected
[ ] Local test completed successfully
[ ] Logs or final output verified
[ ] Rollback procedure documented

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