Puppet
如何使用 Augeas 註釋掉/取消註釋配置文件中的一行?
假設我在
/etc/syslog.conf
文件中有以下內容:# Log all kernel messages to the console. # Logging much else clutters up the screen. #kern.* /dev/console
我想將其更改
kern.* /var/log/kern.log
為獲取核心日誌的人類可讀時間戳。木偶可以做到:
class syslog::config { file { "/etc/syslog.conf": ensure => present, source => "puppet:///modules/syslog/syslog.conf", require => Class["syslog::install"], notify => Class["syslog::service"], } }
或者我也可以使用
sed -i
.使用Augeas,我可以將此行附加到文件末尾:
class syslog::config { augeas { "syslogkern": context => "/files/etc/syslog.conf", changes => [ "set entry[last()+1]/selector/facility kern", "set entry[last()]/selector/level *", "set entry[last()]/action/file '/var/log/kern.log'", ], } }
或修改目的地:
class syslog::config { augeas { "syslogkern": context => "/files/etc/syslog.conf", onlyif => "get #comment[3] == 'kern.*\t\t\t\t\t\t\t/dev/console'", changes => [ "set #comment[3] 'kern.*\t\t\t\t\t\t\t/var/log/kern.log'", ], } }
但是我如何取消註釋這一行?
更新
這是我一直試圖在之後插入一行的內容
#comment[3]
:augtool> ins facle after /files/etc/syslog.conf/#comment[3] augtool> set /files/etc/syslog.conf/facle/selector/facility kern augtool> set /files/etc/syslog.conf/facle/selector/level * augtool> set /files/etc/syslog.conf/facle/action/file /var/log/kern.log
或者:
augtool> ins facle after /files/etc/syslog.conf/#comment[3] augtool> set /files/etc/syslog.conf/facle[last()] kernlog augtool> set /files/etc/syslog.conf/facle[. = 'kernlog']/selector/facility kern augtool> set /files/etc/syslog.conf/facle[. = 'kernlog']/selector/level * augtool> set /files/etc/syslog.conf/facle[. = 'kernlog']/action/file /var/log/kern.log
但它沒有用:
augtool> save error: Failed to execute command error: saving failed (run 'print /augeas//error' for details) augtool> print /augeas//error /augeas/files/etc/syslog.conf/error = "put_failed" /augeas/files/etc/syslog.conf/error/path = "/files/etc/syslog.conf" /augeas/files/etc/syslog.conf/error/lens = "/usr/share/augeas/lenses/dist/syslog.aug:243.18-.51:" /augeas/files/etc/syslog.conf/error/message = "Failed to match \n ({ } | { /#comment/ = /[^\\001-\\004\\t\\n !+-][^\\001-\\004\\n]*[^\\001-\\004\\t\\n ]|[^\\001-\\004\\t\\n !+-]/ } | { /entry/ })*({ /program/ } | { /hostname/ })*\n with tree\n { \"#comment\" = \"Log all kernel messages to the console.\" } { \"#comment\" = \"Logging much else clutters up the screen.\" } { \"#comment\" = \"kern.*\t\t\t\t\t\t\t/var/log/kern.log\" } { \"facle\" = \"kernlog\" } { \"entry\" } { } { \"#comment\" = \"Log anything (except mail) of level info or higher.\" } { \"#comment\" = \"Don't log private authentication messages!\" } { \"entry\" } { } { \"#comment\" = \"The authpriv file has restricted access.\" } { \"entry\" } { } { \"#comment\" = \"Log all the mail messages in one place.\" } { \"entry\" } { } { } { \"#comment\" = \"Log cron stuff\" } { \"entry\" } { } { \"#comment\" = \"Everybody gets emergency messages\" } { \"entry\" } { } { \"#comment\" = \"Save news errors of level crit and higher in a special file.\" } { \"entry\" } { } { \"#comment\" = \"Save boot messages also to boot.log\" } { \"entry\" } { } { } { \"#comment\" = \"INN\" } { } { \"entry\" } { \"entry\" } { \"entry\" }"
{,Un}評論對於 Augeas 來說是一件複雜的事情,因為它的性質。簡短的回答是 Augeas 目前無法{,un}評論節點。
此票證詳細說明了原因(和建議的解決方案)。
至於你的插入失敗的原因,是因為你創建了一個
facle
節點而不是一個entry
節點。facle
不是 中的已知節點名稱syslog.aug
。因此,您可以這樣做:
augtool> print /files/etc/syslog.conf/ /files/etc/syslog.conf /files/etc/syslog.conf/#comment[1] = "titi" /files/etc/syslog.conf/#comment[2] = "kern.* /dev/console" /files/etc/syslog.conf/#comment[3] = "toto" augtool> defvar kerncomment /files/etc/syslog.conf/#comment[. =~ regexp('kern.* +/dev/console')][count(/files/etc/syslog.conf/entry[selector/facility = "kern" and selector/level = "*" and action/file = "/var/log/kern.log"]) = 0] augtool> ins entry after $kerncomment augtool> defvar kernentry /files/etc/syslog.conf/entry[preceding-sibling::*[1][$kerncomment]] augtool> set $kernentry/selector/facility kern augtool> set $kernentry/selector/level * augtool> set $kernentry/action/file /var/log/kern.log augtool> rm $kerncomment augtool> print /files/etc/syslog.conf/ /files/etc/syslog.conf /files/etc/syslog.conf/#comment[1] = "titi" /files/etc/syslog.conf/entry /files/etc/syslog.conf/entry/selector /files/etc/syslog.conf/entry/selector/facility = "kern" /files/etc/syslog.conf/entry/selector/level = "*" /files/etc/syslog.conf/entry/action /files/etc/syslog.conf/entry/action/file = "/var/log/kern.log" /files/etc/syslog.conf/#comment[3] = "toto" augtool> save Saved 1 file(s) augtool>
第一行確保此更改是冪等的。如果您使用 Puppet,這可以簡化:您可以通過使用
onlyif
.