تنظیمات resolv.conf

alikarimi20200 — Sun, 18 Jan 2026 13:01:30 +0330

On modern Linux systems, /etc/resolv.conf is often auto-generated, so any manual edits get overwritten. This is expected behavior, not a bug.Below is why it happens and how to control it, depending on what manages DNS on your system.Why /etc/resolv.conf keeps changingOne (or more) of these services rewrites it:systemd-resolvedNetworkManagerDHCP client (dhclient)resolvconf / openresolvYou can’t safely edit /etc/resolv.conf directly unless you disable the manager that owns it.Identify who manages itRun:ls -l /etc/resolv.conf Common results:/run/systemd/resolve/stub-resolv.conf → systemd-resolved/run/NetworkManager/resolv.conf → NetworkManager/etc/resolvconf/run/resolv.conf → resolvconfRegular file → possibly dhclient or staticFixes by manager✅ systemd-resolved (most common)Option A: Set DNS properly (recommended)Edit:sudo nano /etc/systemd/resolved.conf Example:[Resolve] DNS=1.1.1.1 8.8.8.8 FallbackDNS=9.9.9.9 Apply:sudo systemctl restart systemd-resolved Option B: Disable systemd-resolved (advanced)sudo systemctl disable --now systemd-resolved sudo rm /etc/resolv.conf Create a static file:sudo nano /etc/resolv.conf nameserver 1.1.1.1 nameserver 8.8.8.8 ⚠️ This removes DNS auto-management (not recommended on laptops).✅ NetworkManagerEdit the connection:nmcli connection show nmcli connection modify ipv4.ignore-auto-dns yes nmcli connection modify ipv4.dns "1.1.1.1 8.8.8.8" nmcli connection up ✅ DHCP client (dhclient)Prevent DNS overwrite:sudo nano /etc/dhcp/dhclient.conf Add:supersede domain-name-servers 1.1.1.1, 8.8.8.8; ✅ resolvconf / openresolvEdit:sudo nano /etc/resolvconf.conf Or add DNS to:/etc/resolvconf/resolv.conf.d/head Then apply:sudo resolvconf -u 🚫 What NOT to do❌ Don’t edit /etc/resolv.conf directly unless you know it’s unmanaged❌ Don’t chattr +i /etc/resolv.conf (breaks networking tools)Quick recommendationDesktop / laptop → Configure DNS via systemd-resolved or NetworkManagerServer → Either systemd-resolved config or static /etc/resolv.conf

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تنظیمات resolv.conf