Disable IPv6 on CentOS6 OpenVZ

Posted on September 5, 2012.

In order to disable ipv6, you will have to disable checkpoint/restore (suspend/resume/migrate functionality) as the modules vzrst and vzcpt have ipv6 as a dependancy.

Edit /etc/init.d/vz, find and comment out this line:

CPT_MODULES="vzcpt vzrst"
Disable ipv6 module by creating /etc/modprobe.d/ipv6-off.conf

alias net-pf-10 off alias ipv6 off
Reboot.

Dovecot Sieve — Deliver mail based on Spamassassin score

Posted on August 28, 2012.

I don’t reject any spam e-mail as I want my system to learn from the contents. It gets delivered to a folder and I check it now and then.

However the spam I receieve is beyond rediculous, approaching 400 messages a day. It isn’t feasable for me to check the spam folder for false positives.

The following sieve rule allows me to split the spam into 2 folders based on there Spamassassin score. >=9 “Spam” .. <9 "SpamLikely"

require ["variables", "relational","comparator-i;ascii-numeric", "regex","imap4flags","fileinto"];
 
# Extract integer from X-Spam-Score
set "iSpamLevel" "0";
if header :regex "X-Spam-Score" "([0-9]+)(\.[0-9]+)?" {
        set "iSpamLevel" "${1}";
}
 
# rule:[SpamLikely]
if allof (header :is "X-Spam-Flag" "Yes",
        string :value "lt" :comparator "i;ascii-numeric" "${iSpamLevel}" "9")
{
        fileinto "SpamLikely";
}
# rule:[Spam]
elsif allof (header :is "X-Spam-Flag" "Yes",
        string :value "ge" :comparator "i;ascii-numeric" "${iSpamLevel}" "9")
{
        fileinto "Spam";
}

require ["variables", "relational","comparator-i;ascii-numeric", "regex","imap4flags","fileinto"];

# Extract integer from X-Spam-Score

set "iSpamLevel" "0";

if header :regex "X-Spam-Score" "([0-9]+)(\.[0-9]+)?" {

set "iSpamLevel" "${1}";

}

# rule:[SpamLikely]

if allof (header :is "X-Spam-Flag" "Yes",

string :value "lt" :comparator "i;ascii-numeric" "${iSpamLevel}" "9")

{

fileinto "SpamLikely";

}

# rule:[Spam]

elsif allof (header :is "X-Spam-Flag" "Yes",

string :value "ge" :comparator "i;ascii-numeric" "${iSpamLevel}" "9")

{

fileinto "Spam";

}

Zabbix Unsupported Items Status

Posted on January 5, 2012.

Following on from the zabbix status script, I have put togethor another script to list any unsupported items on agents.

For an item to go unsupported, it usually means something is wrong with the agent, so I add this script to /etc/cron.hourly.

The SQL query to get the list of unsupported items is,

SELECT
        hosts.host AS hostname,
        items.description AS item,
        items.key_ AS "key"
FROM
        items
RIGHT JOIN
        hosts ON items.hostid=hosts.hostid
WHERE
        items.status = 3;

SELECT

hosts.host AS hostname,

items.description AS item,

items.key_ AS "key"

FROM

items

RIGHT JOIN

hosts ON items.hostid=hosts.hostid

WHERE

items.status = 3;

Download
zabbix-unsupported-status.sh (1.3 KiB, 2,444 hits)

1 Comment

backuppc: “failures that need attention” — remove entry

Posted on January 3, 2012.

A backup failed so I disabled the host, but the status page still listed the failure.

To delete this entry:

Stop backuppc – /etc/init.d/backuppc stop
Search /var/lib/backuppc/log/status.pl for the failed host and delete the entry.
Restart backuppc – /etc/init.d/backuppc start

backuppc: Use of qw(…) as parentheses is deprecated

Posted on January 3, 2012.

If you upgrade Perl to 5.13.5 or beyond, backuppc will begin to spew this warning at every oppurtunity. Debian/wheezy currently has these warnings on startup and in backuppc logs.

Debian bug #650522 suggests surrounding each use of qw(…) with rounded parenthesis: (qw(…)). There are a lot these used throughout backuppc, so I took a slightly less ingenious but just as effective route.

By adding: “no warnings 'deprecated';” to the beginning of each file that uses qw(…), the warnings are suppressed. This change can be scripted by using the following one-liner:

grep -ril 'qw(' /usr/share/backuppc/lib/BackupPC/|while read file; do sed -i "1i no warnings 'deprecated';" $file; done

1	grep -ril 'qw(' /usr/share/backuppc/lib/BackupPC/\|while read file; do sed -i "1i no warnings 'deprecated';" $file; done

The location /usr/share/backuppc/lib/BackupPC/ is used on Debian/wheezy and may need adjusting for other distros.