sudo nano /etc/polkit-1/rules.d/49-disable-shutdown.rules

polkit.addRule(function(action, subject) {
    if ((action.id == "org.freedesktop.login1.power-off" ||
         action.id == "org.freedesktop.login1.reboot") &&
        !subject.isInGroup("wheel")) {
        return polkit.Result.NO;
    }
});

sudo nano /etc/polkit-1/rules.d/50-disable-network.rules

polkit.addRule(function(action, subject) {
    if (action.id.indexOf("org.freedesktop.network-manager.settings.") == 0 &&
        !subject.isInGroup("netadmin")) {
        return polkit.Result.NO;
    }
});

pkaction | grep power
pkaction | grep network

sudo find /var/log -type f -mtime +30 -delete

sudo find /var/log -type f -mtime +30 \
  ! -name "*.conf" \
  ! -path "/var/log/journal/*" \
  -delete

sudo find /var/cache -type f -mtime +15 -delete

sudo du -sh /var/cache/*

sudo find /var/log -type f -mtime +30 -print

sudo crontab -e

0 3 * * 0 find /var/log -type f -mtime +30 -delete

ss -tulpn

LISTEN 0 128 0.0.0.0:22 0.0.0.0:* users:(("sshd",pid=1234,fd=3))

lsof -i -P -n

netstat -tulnp

watch -n 60 'ss -tupn >> /var/log/active_connections.log'

ss -tupn | logger -t net-audit

# Создаём namespace
sudo ip netns add testns

# Делаем пару виртуальных интерфейсов
sudo ip link add veth0 type veth peer name veth1

# Перемещаем один интерфейс внутрь namespace
sudo ip link set veth1 netns testns

# На основной сети
sudo ip addr add 192.168.100.1/24 dev veth0
sudo ip link set veth0 up

# В namespace
sudo ip netns exec testns ip addr add 192.168.100.2/24 dev veth1
sudo ip netns exec testns ip link set veth1 up
sudo ip netns exec testns ip link set lo up

sudo ip netns exec testns ping 192.168.100.1

dig example.com
dig @8.8.8.8 example.com +short

resolvectl status

resolvectl query example.com

{
  date
  dig +short example.com
  ip route get 8.8.8.8
} >> /var/log/netcheck.log 2>&1