[systemd-devel] nss-mymachines: slow name resolution

[Kai Krakow]

Hello!

I've followed the man page guide to setup mymachines name resolution in
nsswitch.conf. It works. But it takes around 4-5 seconds to resolve a
name. This is unexpected and cannot be used in production.

I'm using systemd-networkd and systemd-resolved.

This is my config:

# /etc/nsswitch.conf:
# $Header: /var/cvsroot/gentoo/src/patchsets/glibc/extra/etc/nsswitch.conf,v 1.1 2006/09/29 23:52:23 vapier Exp $

passwd:      compat mymachines
shadow:      compat
group:       compat mymachines

# passwd:    db files nis
# shadow:    db files nis
# group:     db files nis

hosts:       files resolve mymachines myhostname
networks:    files

services:    db files
protocols:   db files
rpc:         db files
ethers:      db files
netmasks:    files
netgroup:    files
bootparams:  files

automount:   files
aliases:     files


Not sure if the errors below are related:

$ systemctl status systemd-{network,resolve}d
● systemd-networkd.service - Network Service
   Loaded: loaded (/usr/lib64/systemd/system/systemd-networkd.service; enabled; vendor preset: enabled)
   Active: active (running) since Sa 2016-02-13 13:40:51 CET; 24h ago
     Docs: man:systemd-networkd.service(8)
 Main PID: 763 (systemd-network)
   Status: "Processing requests..."
    Tasks: 1 (limit: 512)
   Memory: 1.1M
      CPU: 400ms
   CGroup: /system.slice/systemd-networkd.service
           └─763 /usr/lib/systemd/systemd-networkd

Feb 14 13:11:27 jupiter.sol.local systemd-networkd[763]: Could not send rtnetlink message: Invalid argument
Feb 14 13:11:27 jupiter.sol.local systemd-networkd[763]: Could not remove route: Invalid argument
Feb 14 13:18:22 jupiter.sol.local systemd-networkd[763]: Could not send rtnetlink message: Invalid argument
Feb 14 13:18:22 jupiter.sol.local systemd-networkd[763]: Could not remove route: Invalid argument
Feb 14 13:25:43 jupiter.sol.local systemd-networkd[763]: Could not send rtnetlink message: Invalid argument
Feb 14 13:25:43 jupiter.sol.local systemd-networkd[763]: Could not remove route: Invalid argument
Feb 14 13:30:23 jupiter.sol.local systemd-networkd[763]: Could not send rtnetlink message: Invalid argument
Feb 14 13:30:23 jupiter.sol.local systemd-networkd[763]: Could not remove route: Invalid argument
Feb 14 13:39:57 jupiter.sol.local systemd-networkd[763]: Could not send rtnetlink message: Invalid argument
Feb 14 13:39:57 jupiter.sol.local systemd-networkd[763]: Could not remove route: Invalid argument

● systemd-resolved.service - Network Name Resolution
   Loaded: loaded (/usr/lib64/systemd/system/systemd-resolved.service; enabled; vendor preset: enabled)
   Active: active (running) since Sa 2016-02-13 13:40:51 CET; 24h ago
     Docs: man:systemd-resolved.service(8)
 Main PID: 824 (systemd-resolve)
   Status: "Processing requests..."
    Tasks: 1 (limit: 512)
   Memory: 1.0M
      CPU: 2.122s
   CGroup: /system.slice/systemd-resolved.service
           └─824 /usr/lib/systemd/systemd-resolved

Feb 13 13:40:51 jupiter.sol.local systemd[1]: Starting Network Name Resolution...
Feb 13 13:40:51 jupiter.sol.local systemd-resolved[824]: Using system hostname 'jupiter'.
Feb 13 13:40:51 jupiter.sol.local systemd[1]: Started Network Name Resolution.
Feb 13 13:40:56 jupiter.sol.local systemd-resolved[824]: Switching to DNS server 192.168.4.254 for interface enp5s0.

-- 
Regards,
Kai

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