ECS: Ventetid, der opstår, når du logger på eller godkender til en bestemt node

Når du opretter en ssh-forbindelse til en node, kører sudo eller en anden kommando, der kræver godkendelse, opstår der en forsinkelse. Efter forsinkelsen kører kommandoen normalt.  Noden er ikke tungt belastet, og oppetiden viser normale belastningsgennemsnit. 

Hvis omfang er aktiveret for en ssh-forbindelse ved hjælp af -vvv, opstår loginforsinkelsen efter "pledge: exec"

Eksempel:

admin:~> ssh 169.254.1.2 -vvv
OpenSSH_7.2p2, OpenSSL 1.0.2p-fips  14 Aug 2018
debug1: Reading configuration data /home/admin/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 25: Applying options for *
debug2: resolving "169.254.1.2" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 169.254.1.2 [169.254.1.2] port 22.
debug1: Connection established.
... <truncated debugging>
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting no-more-sessions@openssh.com
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: exec

Efter en pause i 20+ sekunder fortsætter login normalt.


På den node, der har problemet, hvis dbus-servicestatus er markeret, rapporterer den timeouts:

admin:~> sudo systemctl status dbus
● dbus.service - D-Bus System Message Bus
   Loaded: loaded (/usr/lib/systemd/system/dbus.service; static; vendor preset: disabled)
   Active: active (running) since Fri 2024-01-23 04:56:00 UTC; 1 months 2 days ago
     Docs: man:dbus-daemon(1)
 Main PID: 3060 (dbus-daemon)
    Tasks: 1 (limit: 512)
   Memory: 5.8M
      CPU: 10h 45min 897ms
   CGroup: /system.slice/dbus.service
           └─3060 /bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation

Mar 22 18:28:54 <ecs-node-fqdn> dbus[3060]: [system] Connection has not authenticated soon enough, closing it (auth_timeout=30000ms, elapsed: 30000ms)
Mar 22 18:28:54 <ecs-node-fqdn> dbus[3060]: [system] Connection has not authenticated soon enough, closing it (auth_timeout=30000ms, elapsed: 30000ms)
Mar 22 18:28:54 <ecs-node-fqdn> dbus[3060]: [system] Connection has not authenticated soon enough, closing it (auth_timeout=30000ms, elapsed: 30000ms)
Mar 22 18:28:54 <ecs-node-fqdn> dbus[3060]: [system] Connection has not authenticated soon enough, closing it (auth_timeout=30000ms, elapsed: 30000ms)
Mar 22 18:28:54 <ecs-node-fqdn> dbus[3060]: [system] Connection has not authenticated soon enough, closing it (auth_timeout=30000ms, elapsed: 30000ms)
Mar 22 18:28:54 <ecs-node-fqdn> dbus[3060]: [system] Connection has not authenticated soon enough, closing it (auth_timeout=30000ms, elapsed: 30000ms)
Mar 22 18:29:22 <ecs-node-fqdn> dbus[3060]: [system] Connection has not authenticated soon enough, closing it (auth_timeout=30000ms, elapsed: 30009ms)
Mar 22 18:29:24 <ecs-node-fqdn> dbus[3060]: [system] Connection has not authenticated soon enough, closing it (auth_timeout=30000ms, elapsed: 30002ms)
Mar 22 18:29:54 <ecs-node-fqdn> dbus[3060]: [system] Connection has not authenticated soon enough, closing it (auth_timeout=30000ms, elapsed: 30000ms)
Mar 22 18:30:01 <ecs-node-fqdn> dbus[3060]: [system] Connection has not authenticated soon enough, closing it (auth_timeout=30000ms, elapsed: 30000ms)

Lignende timeoutmeddelelser findes i /var/log/messages

Der er nået en forbindelsesgrænse for dbus-tjenesten, hvilket medfører en forsinkelse for login og/eller godkendelse

Dette problem kan løses ved at genstarte dbus-tjenesten og også for primære noder: dnsmasq-tjenesten. Der er ingen forventet effekt, men få kundegodkendelse, hvis det er nødvendigt. 

Fra den node, der har problemet, genstart dbus ved hjælp af kommandoen:  
 

sudo systemctl restart dbus
admin:~> sudo systemctl restart dbus

Der forventes ikke noget output fra denne kommando. 

Når kommandoen er fuldført, skal du kontrollere status for dbus-tjenesten for at sikre, at den er "aktiv (kører)" ved at køre nedenstående kommando:
 

sudo systemctl status dbus
admin ~> sudo systemctl status dbus
● dbus.service - D-Bus System Message Bus
   Loaded: loaded (/usr/lib/systemd/system/dbus.service; static; vendor preset: disabled)
   Active: active (running) since Fri 2024-07-19 18:07:00 UTC; 5s ago
     Docs: man:dbus-daemon(1)
 Main PID: 19340 (dbus-daemon)
    Tasks: 1 (limit: 512)
   Memory: 884.0K
      CPU: 22ms
   CGroup: /system.slice/dbus.service
           └─19340 /bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation

Hvis noden er en primær knude (normalt node 1), er det også nødvendigt at genstarte dnsmasq med kommandoen: 
 

sudo systemctl restart dnsmasq
admin:~> sudo systemctl restart dnsmasq

Der forventes ikke noget output fra denne kommando. 

Efter genstart af dnsmasq skal du validere, at tjenesten er "aktiv (kører)" ved hjælp af kommandoen:
 

sudo systemctl status dnsmasq
admin~> sudo systemctl status dnsmasq
● dnsmasq.service - DNS caching server.
   Loaded: loaded (/usr/lib/systemd/system/dnsmasq.service; disabled; vendor preset: disabled)
  Drop-In: /run/systemd/generator/dnsmasq.service.d
           └─50-insserv.conf-$named.conf
   Active: active (running) since Fri 2024-07-19 18:14:47 UTC; 2s ago
  Process: 61272 ExecStartPre=/usr/sbin/dnsmasq --test (code=exited, status=0/SUCCESS)
 Main PID: 61297 (dnsmasq)
    Tasks: 1 (limit: 512)
   Memory: 2.1M
      CPU: 8ms
   CGroup: /system.slice/dnsmasq.service
           └─61297 /usr/sbin/dnsmasq --log-async --enable-dbus --keep-in-foreground

Når tjenesterne er blevet genstartet, skal du teste adgangen til noden ved at bruge ssh eller køre en sudo-kommando for at observere, at forsinkelsen er løst. 

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