[CentOS] centos email server suddenly much slower. What to do?

Marco Fioretti marco.fioretti at gmail.com
Thu Sep 6 13:58:08 EDT 2012


> One thing to check is that the DNS servers in /etc/resolv.conf are
> answering quickly  (dig some_name.domain @server_ip).

The server runs no DNS server itself.

I ran  dig www.google.it @213.179.193.200 (ie the complete real IP of
my primary dns server as listed in /etc/resolv.conf) and this is the
result:
[root at vps728 ~]# dig www.google.it @213.179.193.200

; <<>> DiG 9.2.4 <<>> www.google.it @213.179.193.200
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37012
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 4, ADDITIONAL: 0

;; QUESTION SECTION:
;www.google.it.                 IN      A

;; ANSWER SECTION:
www.google.it.          300     IN      A       173.194.35.151
www.google.it.          300     IN      A       173.194.35.152
www.google.it.          300     IN      A       173.194.35.159

;; AUTHORITY SECTION:
google.it.              10800   IN      NS      ns2.google.com.
google.it.              10800   IN      NS      ns3.google.com.
google.it.              10800   IN      NS      ns4.google.com.
google.it.              10800   IN      NS      ns1.google.com.

;; Query time: 2011 msec
;; SERVER: 213.179.193.200#53(213.179.193.200)
;; WHEN: Thu Sep  6 13:41:43 2012
;; MSG SIZE  rcvd: 161

as far as the queue goes, it was empty. I run postsuper -d ALL and
postuper -d ALL deferred, just in case, but no change

Thanks,
Marco


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