Voici comment contrôler vos services locaux et leurs états:

service --status-all

ou

systemctl status squid.service 

 [ - ]  alsa-utils
 [ - ]  apache-htcacheclean
 [ + ]  apache2
 [ + ]  avahi-daemon
 [ - ]  bluetooth
 [ - ]  console-setup.sh
 [ + ]  cron
 [ + ]  dbus
 [ + ]  dhcpcd
 [ + ]  domoticz.sh
 [ + ]  dphys-swapfile
 [ + ]  fail2ban
 [ + ]  fake-hwclock
 [ - ]  hwclock.sh
 [ - ]  keyboard-setup.sh
 [ + ]  kmod
 [ + ]  mysql
 [ + ]  networking
 [ - ]  nfs-common
 [ + ]  nfs-kernel-server
 [ + ]  nmbd
 [ + ]  openvpn
 [ - ]  paxctld
 [ - ]  pcscd
 [ + ]  procps
 [ + ]  raspi-config
 [ ? ]  rng-tools
 [ + ]  rpcbind
 [ - ]  rpivpn
 [ - ]  rsync
 [ + ]  rsyslog
 [ - ]  samba-ad-dc
 [ + ]  smbd
 [ + ]  squid
 [ + ]  ssh
 [ - ]  sudo
 [ + ]  triggerhappy
 [ + ]  udev

+ : Démarré
- : Arrèté

service squid status

ou

systemctl stop squid.service 

● squid.service - Squid Web Proxy Server
   Loaded: loaded (/lib/systemd/system/squid.service; enabled; vendor preset: enabled)
   Active: active (running) since Sat 2021-02-20 11:48:22 CET; 27min ago
     Docs: man:squid(8)
  Process: 410 ExecStartPre=/usr/sbin/squid --foreground -z (code=exited, status=0/SUCCESS)
  Process: 557 ExecStart=/usr/sbin/squid -sYC (code=exited, status=0/SUCCESS)
 Main PID: 560 (squid)
    Tasks: 9 (limit: 2200)
   Memory: 25.8M
   CGroup: /system.slice/squid.service
           ├─560 /usr/sbin/squid -sYC
           ├─562 (squid-1) --kid squid-1 -sYC
           ├─565 (basic_ncsa_auth) /etc/squid/users
           ├─566 (basic_ncsa_auth) /etc/squid/users
           ├─567 (basic_ncsa_auth) /etc/squid/users
           ├─568 (basic_ncsa_auth) /etc/squid/users
           ├─569 (basic_ncsa_auth) /etc/squid/users
           ├─576 (logfile-daemon) /var/log/squid/access.log
           └─598 (pinger)
 
févr. 20 11:48:23 RazorbackPi squid[562]: Max Swap size: 0 KB
févr. 20 11:48:23 RazorbackPi squid[562]: Using Least Load store dir selection
févr. 20 11:48:23 RazorbackPi squid[562]: Current Directory is /
févr. 20 11:48:24 RazorbackPi squid[562]: Finished loading MIME types and icons.
févr. 20 11:48:24 RazorbackPi squid[562]: HTCP Disabled.
févr. 20 11:48:24 RazorbackPi squid[562]: Pinger socket opened on FD 24
févr. 20 11:48:24 RazorbackPi squid[562]: Squid plugin modules loaded: 0
févr. 20 11:48:24 RazorbackPi squid[562]: Adaptation support is off.
févr. 20 11:48:24 RazorbackPi squid[562]: Accepting HTTP Socket connections at local=[::]:8080 remote=[::] FD 22 flags=9
févr. 20 11:48:24 RazorbackPi squid[562]: storeLateRelease: released 0 objects

systemctl disable [nom du service].service	Désactiver un service
systemctl stop [nom du service].service	Arrêter un service
systemctl start [nom du service].service	Démarrer un service

systemctl disable squid.service
Synchronizing state of squid.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install disable squid
Removed /etc/systemd/system/multi-user.target.wants/squid.service.

systemctl enable squid.service
Synchronizing state of squid.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable squid
Created symlink /etc/systemd/system/multi-user.target.wants/squid.service → /lib/systemd/system/squid.service.