-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 17/09/15 04:16, Jay Leafey wrote: > I recently stood up an EL7 box with Mailman for a few lists I run > for some friends. My old install, on an EL6 system, ran with no > issues for several years but I was induced to upgrade by a > "hardware casualty" on the old system. I was going to have to > rebuild anyway, so why not take it as an opportunity to try EL7? > > The build went fine and I was able to migrate the lists over with > no issues, but once I got there just about everything to do with > Mailman operations were painfully slow. For example, "list_lists" > took 5 seconds of "real" time. I was used to it taking _much_ less > as I only have about 6 lists. This affected both the command-line > Mailman tools and the web interface. My first inclination was to > blame Python, but other code executed just fine with it. > > While testing I tried an strace of list_lists and found that it > was timing out on a read operation to a socket to the Avahi daemon > (/var/run/avahi-daemon/socket) while trying to resolve the > link-local IPv6 address. Having flashbacks to Sendmail stalling on > DNS issues I decided to try fixing resolution first. > > As a test I put the link-local address into my /etc/hosts file with > a localized name. Running list_lists then took about 0.19 seconds > "real" time! The web interface also changed from painfully slow to > it's previous behaviour on EL6. > > I imagine just turning off IPv6 would work as well, but I have an > actual use case that is a lot easier with it turned on. I don't > know if anybody else has seen this, but thought it might be handy > for someone else. > Thanks a lot for having shared this. I haven't tried (yet) to test mailman on CentOS 7 and the only one we have is on CentOS 6, and (unfortunately) no ipv6 addr, but I do remember having had to do this for ipv4 addr too (in /etc/hosts) to bypass the high number of dns requests (in the past) - -- Fabian Arrotin The CentOS Project | http://www.centos.org gpg key: 56BEC54E | twitter: @arrfab -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iEYEARECAAYFAlX6ZHwACgkQnVkHo1a+xU4GyQCdFCkLZQNqV37iISS4Ejn1kqbg xMAAoIrdK0Hmyx2uEk5vSSkWOdglH6xF =+p+d -----END PGP SIGNATURE-----