[Dovecot] Gah, pop3 falling over

[Brandon Lamb]

On Mon, Oct 27, 2008 at 9:20 AM, Brandon Lamb <brandonlamb at gmail.com> wrote:
> Why would I be seeing a million of these?
>
> dovecot: 2008-10-27 09:12:33 Warning:
> chdir(/mail/mail/domain/u/username/) blocked for 18 secs
>
> Two servers were working fine and then all of a sudden this morning
> bam 500 load and theres a million dovecots and tons of these lines in
> the logs.
>
> It is like everyone gets up at exactly 8:30 and hits the pop3 server at once.
>
> Anyway, dovecot 1.1.5, nfs mount, debian lenny/sid amd64,
> 2.6.26-1-amd64 i had the performance mode options for login
> configured, i just set back to the single process per login though, I
> think that hasnt fallen over that way but I really dont remember
> anymore. I included the dovecot -n using the suggest performance login
> settings? Do I have something totally out of whack?
>
> # 1.1.5: /etc/dovecot/dovecot.conf
> base_dir: /var/run/dovecot/
> log_path: /var/log/dovecot/dovecot.log
> info_log_path: /var/log/dovecot/info.log
> log_timestamp: %Y-%m-%d %H:%M:%S
> protocols: imap pop3
> listen(default): 208.200.248.2 208.200.248.7
> listen(imap): 208.200.248.2 208.200.248.7
> listen(pop3): 208.200.248.2
> disable_plaintext_auth: no
> login_dir: /var/run/dovecot/login
> login_executable(default): /usr/local/libexec/dovecot/imap-login
> login_executable(imap): /usr/local/libexec/dovecot/imap-login
> login_executable(pop3): /usr/local/libexec/dovecot/pop3-login
> login_greeting: Hello there.
> login_log_format_elements: <%u> <%r>
> login_log_format: %s
> login_process_per_connection: no
> login_process_size: 128
> login_processes_count: 4
> login_max_processes_count: 8
> login_max_connections: 128
> valid_chroot_dirs: /mail/mail
> mail_max_userip_connections(default): 15
> mail_max_userip_connections(imap): 15
> mail_max_userip_connections(pop3): 4
> verbose_proctitle: yes
> first_valid_uid: 8
> last_valid_uid: 8
> first_valid_gid: 8
> last_valid_gid: 8
> mail_access_groups: mail
> mail_privileged_group: mail
> mail_uid: 8
> mail_gid: 8
> mail_location: maildir:~/:INDEX=/dovecot-index
> mailbox_idle_check_interval: 60
> mmap_disable: yes
> mail_nfs_storage: yes
> mail_nfs_index: yes
> mailbox_list_index_disable: no
> mail_executable(default): /usr/local/libexec/dovecot/imap
> mail_executable(imap): /usr/local/libexec/dovecot/imap
> mail_executable(pop3): /usr/local/libexec/dovecot/pop3
> mail_plugins(default): quota imap_quota
> mail_plugins(imap): quota imap_quota
> mail_plugins(pop3):
> mail_plugin_dir(default): /usr/local/lib/dovecot/imap
> mail_plugin_dir(imap): /usr/local/lib/dovecot/imap
> mail_plugin_dir(pop3): /usr/local/lib/dovecot/pop3
> mail_log_prefix: %Ls <%u>:
> imap_client_workarounds(default): outlook-idle delay-newmail
> imap_client_workarounds(imap): outlook-idle delay-newmail
> imap_client_workarounds(pop3):
> pop3_no_flag_updates(default): no
> pop3_no_flag_updates(imap): no
> pop3_no_flag_updates(pop3): yes
> pop3_client_workarounds(default):
> pop3_client_workarounds(imap):
> pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
> pop3_logout_format(default): top=%t/%p, retr=%r/%b, del=%d/%m, size=%s
> pop3_logout_format(imap): top=%t/%p, retr=%r/%b, del=%d/%m, size=%s
> pop3_logout_format(pop3): retr=%r/%b, del=%d/%m, size=%s
> auth default:
>  mechanisms: plain login
>  default_realm: olypen.com
>  cache_size: 8192
>  cache_ttl: 300
>  worker_max_count: 60
>  passdb:
>    driver: sql
>    args: /etc/dovecot/dovecot-sql.conf
>  userdb:
>    driver: prefetch
>  userdb:
>    driver: sql
>    args: /etc/dovecot/dovecot-sql.conf
>  socket:
>    type: listen
>    client:
>      path: /var/run/dovecot/auth-client
>      mode: 438
>      user: mail
>      group: mail
>    master:
>      path: /var/run/dovecot/auth-master
>      mode: 438
>      user: mail
>      group: mail
> plugin:
>  quota: maildir
>  quota_rule: Trash:ignore
>  quota_rule2: Sent:ignore
>  quota_rule3: Spam:ignore
>  quota_rule4: Archive:ignore
>  quota_rule5: Sent Items:ignore
>  quota_rule6: Deleted Items:ignore
>  auth_socket_path: /var/run/dovecot/auth-master

dotlock_use_excl = yes
fsync_disable = no
lock_method = fcntl

Could I be running into some nfs locking issue? Wouldnt a reboot clear
any nfs um, handles or whatnot that the mail server(s) might have? Do
these look like the right values for using NFS? Should I try using
lock_method = dotlock instead?