How to enable and disable services on boot in Linux

Most Linux systems use systemd to manage startup services; check with ps -p 1. Use systemctl enable/disable to control boot startup, and systemctl start/stop for immediate action. Older systems use SysVinit tools like update-rc.d or chkconfig. Enable a service at boot with sudo systemctl enable SERVICE_NAME, disable with sudo systemctl disable SERVICE_NAME, and check status with systemctl is-enabled. Use --now flag to enable and start immediately.

Managing services at boot time in Linux depends on the init system your distribution uses. Most modern Linux systems use systemd, while older ones may use SysVinit or Upstart. Below are the common methods for enabling and disabling services during system startup.

Using systemd (Most Modern Distributions)

If your system uses systemd (such as Ubuntu 16.04 , Debian 8 , CentOS 7 , Fedora), use the systemctl command to manage services at boot.

• sudo systemctl enable SERVICE_NAME

This creates a symbolic link from the system’s copy of the service file (usually in /etc/systemd/system/) to the appropriate systemd target (like multi-user.target).

• sudo systemctl disable SERVICE_NAME

This removes the symbolic link, preventing the service from starting automatically at boot.

• systemctl is-enabled SERVICE_NAME — returns "enabled", "disabled", or "static"

Examples:

• sudo systemctl enable nginx — enables Nginx to start at boot
• sudo systemctl disable apache2 — disables Apache from starting automatically

Using SysVinit (Older Systems)

On older distributions that use SysVinit, the update-rc.d (Debian/Ubuntu) or chkconfig (RHEL/CentOS) commands are used.

• sudo update-rc.d SERVICE_NAME defaults — enables service
• sudo update-rc.d SERVICE_NAME remove — disables service

• sudo chkconfig SERVICE_NAME on — enable service
• sudo chkconfig SERVICE_NAME off — disable service

You can also list current settings with:

• chkconfig --list

Immediate Start/Stop vs Boot Behavior

Note that enabling/disabling controls only whether the service starts at boot. To control the service immediately:

• sudo systemctl start SERVICE_NAME — starts now
• sudo systemctl stop SERVICE_NAME — stops now
• sudo systemctl restart SERVICE_NAME — restarts now

Enabling does not start the service; you need to start it separately unless you use:

• sudo systemctl enable --now SERVICE_NAME — enables and starts immediately
• sudo systemctl disable --now SERVICE_NAME — disables and stops immediately

Basically, use systemctl on modern systems. Check your system with ps -p 1 — if it shows systemd, you’re using systemd. The commands are simple and consistent once you know which init system is running.

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