rsyslogで特定のログ出力を抑止 – CentOS 7

CentOS 7で特定の文字列を含むログ出力を抑止する方法です｡

20.2. RSYSLOG の基本設定
https://access.redhat.com/documentation/ja-JP/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/s1-basic_configuration_of_rsyslog.html

下記のサイトがとても参考になりました｡
rsyslog 特定のログに対するフィルタ
http://www.geocities.jp/yasasikukaitou/rsyslog-filter.html

設定ファイルは/etc/rsyslog.conf

# rsyslog configuration file

# For more information see /usr/share/doc/rsyslog-*/rsyslog_conf.html
# If you experience problems, see http://www.rsyslog.com/doc/troubleshoot.html

#### MODULES ####
# The imjournal module bellow is now used as a message source instead of imuxsock.
$ModLoad imuxsock # provides support for local system logging (e.g. via logger command)
$ModLoad imjournal # provides access to the systemd journal
#$ModLoad imklog # reads kernel messages (the same are read from journald)
#$ModLoad immark  # provides --MARK-- message capability

# Provides UDP syslog reception
#$ModLoad imudp
#$UDPServerRun 514

# Provides TCP syslog reception
#$ModLoad imtcp
#$InputTCPServerRun 514

#### GLOBAL DIRECTIVES ####
# Where to place auxiliary files
$WorkDirectory /var/lib/rsyslog

# Use default timestamp format
$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat

# File syncing capability is disabled by default. This feature is usually not required,
# not useful and an extreme performance hit
#$ActionFileEnableSync on

# Include all config files in /etc/rsyslog.d/
$IncludeConfig /etc/rsyslog.d/*.conf

# Turn off message reception via local log socket;
# local messages are retrieved through imjournal now.
$OmitLocalLogging on

# File to store the position in the journal
$IMJournalStateFile imjournal.state

#### RULES ####
# Log all kernel messages to the console.
# Logging much else clutters up the screen.
#kern.*                                                 /dev/console

# Log anything (except mail) of level info or higher.
# Don't log private authentication messages!
*.info;mail.none;authpriv.none;cron.none                /var/log/messages

# The authpriv file has restricted access.
authpriv.*                                              /var/log/secure

# Log all the mail messages in one place.
mail.*                                                  -/var/log/maillog

# Log cron stuff
cron.*                                                  /var/log/cron

# Everybody gets emergency messages
*.emerg                                                 :omusrmsg:*

# Save news errors of level crit and higher in a special file.
uucp,news.crit                                          /var/log/spooler

# Save boot messages also to boot.log
local7.*                                                /var/log/boot.log

# ### begin forwarding rule ###
# The statement between the begin ... end define a SINGLE forwarding
# rule. They belong together, do NOT split them. If you create multiple
# forwarding rules, duplicate the whole block!
# Remote Logging (we use TCP for reliable delivery)
#
# An on-disk queue is created for this action. If the remote host is
# down, messages are spooled to disk and sent when it is up again.
#$ActionQueueFileName fwdRule1 # unique name prefix for spool files
#$ActionQueueMaxDiskSpace 1g   # 1gb space limit (use as much as possible)
#$ActionQueueSaveOnShutdown on # save messages to disk on shutdown
#$ActionQueueType LinkedList   # run asynchronously
#$ActionResumeRetryCount -1    # infinite retries if host is down
# remote host is: name/ip:port, e.g. 192.168.0.1:514, port optional
#*.* @@remote-host:514
# ### end of the forwarding rule ###

# rsyslog configuration file

# For more information see /usr/share/doc/rsyslog-*/rsyslog_conf.html

# If you experience problems, see http://www.rsyslog.com/doc/troubleshoot.html

#### MODULES ####

# The imjournal module bellow is now used as a message source instead of imuxsock.

$ModLoad imuxsock # provides support for local system logging (e.g. via logger command)

$ModLoad imjournal # provides access to the systemd journal

#$ModLoad imklog # reads kernel messages (the same are read from journald)

#$ModLoad immark # provides --MARK-- message capability

# Provides UDP syslog reception

#$ModLoad imudp

#$UDPServerRun 514

# Provides TCP syslog reception

#$ModLoad imtcp

#$InputTCPServerRun 514

#### GLOBAL DIRECTIVES ####

# Where to place auxiliary files

$WorkDirectory /var/lib/rsyslog

# Use default timestamp format

$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat

# File syncing capability is disabled by default. This feature is usually not required,

# not useful and an extreme performance hit

#$ActionFileEnableSync on

# Include all config files in /etc/rsyslog.d/

$IncludeConfig /etc/rsyslog.d/*.conf

# Turn off message reception via local log socket;

# local messages are retrieved through imjournal now.

$OmitLocalLogging on

# File to store the position in the journal

$IMJournalStateFile imjournal.state

#### RULES ####

# Log all kernel messages to the console.

# Logging much else clutters up the screen.

#kern.* /dev/console

# Log anything (except mail) of level info or higher.

# Don't log private authentication messages!

*.info;mail.none;authpriv.none;cron.none /var/log/messages

# The authpriv file has restricted access.

authpriv.* /var/log/secure

# Log all the mail messages in one place.

mail.* -/var/log/maillog

# Log cron stuff

cron.* /var/log/cron

# Everybody gets emergency messages

*.emerg :omusrmsg:*

# Save news errors of level crit and higher in a special file.

uucp,news.crit /var/log/spooler

# Save boot messages also to boot.log

local7.* /var/log/boot.log

# ### begin forwarding rule ###

# The statement between the begin ... end define a SINGLE forwarding

# rule. They belong together, do NOT split them. If you create multiple

# forwarding rules, duplicate the whole block!

# Remote Logging (we use TCP for reliable delivery)

# An on-disk queue is created for this action. If the remote host is

# down, messages are spooled to disk and sent when it is up again.

#$ActionQueueFileName fwdRule1 # unique name prefix for spool files

#$ActionQueueMaxDiskSpace 1g # 1gb space limit (use as much as possible)

#$ActionQueueSaveOnShutdown on # save messages to disk on shutdown

#$ActionQueueType LinkedList # run asynchronously

#$ActionResumeRetryCount -1 # infinite retries if host is down

# remote host is: name/ip:port, e.g. 192.168.0.1:514, port optional

#*.* @@remote-host:514

# ### end of the forwarding rule ###

すべてのログを対象に文字列”0x99″を含むものは出力しない｡

#### RULES ####
:msg, contains, "0x99"                         stop

# Log all kernel messages to the console.
# Logging much else clutters up the screen.
#kern.*                                                 /dev/console

#### RULES ####

:msg, contains, "0x99" stop

# Log all kernel messages to the console.

# Logging much else clutters up the screen.

#kern.* /dev/console

文法チェック

# /sbin/rsyslogd -N 2
rsyslogd: version 7.4.7, config validation run (level 2), master config /etc/rsyslog.conf
rsyslogd: End of config validation run. Bye.

# /sbin/rsyslogd -N 2

rsyslogd: version 7.4.7, config validation run (level 2), master config /etc/rsyslog.conf

rsyslogd: End of config validation run. Bye.

当初下記のように記述していました｡

#### RULES ####
:msg, contains, "0x99"                         ~

1 2	#### RULES #### :msg, contains, "0x99" ~

文法チェックしたところ

# /sbin/rsyslogd -N 2
rsyslogd: version 7.4.7, config validation run (level 2), master config /etc/rsyslog.conf
rsyslogd: warning: ~ action is deprecated, consider using the 'stop' statement instead [try http://www.rsyslog.com/e/2307 ]
rsyslogd: End of config validation run. Bye.

# /sbin/rsyslogd -N 2

rsyslogd: version 7.4.7, config validation run (level 2), master config /etc/rsyslog.conf

rsyslogd: warning: ~ action is deprecated, consider using the 'stop' statement instead [try http://www.rsyslog.com/e/2307 ]

rsyslogd: End of config validation run. Bye.

のように警告が出力されました｡”~”は廃止予定で代わりに”stop”を検討しているとのことです｡で､”stop”に変えたろころ警告は出なくなりました｡

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RootLinks Co., Ltd.

rsyslogで特定のログ出力を抑止 – CentOS 7

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RootLinks Co., Ltd.

rsyslogで特定のログ出力を抑止 – CentOS 7

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