/etc/rsyslog.conf文件详解
Linux系统自动的log功能，目前由rsyslog服务代管，应该说rsyslog 是syslog 的升级版。
[root@FNSHB109 ~]# cat /etc/rsyslog.conf
rsyslog configuration file
MODULES
#加载模块列表
The imjournal module bellow is now used as a message source instead of imuxsock.
$ModLoad imuxsock # provides support for local system logging (e.g. via logger command)
提供对本地系统日志的支持
KaTeX parse error: Expected 'EOF', got '#' at position 19: …Load imjournal #̲ provides acces…ModLoad imklog # reads kernel messages (the same are read from journald)
读取内核消息
#$ModLoad immark # provides --MARK-- message capability
提供–MARK–消息功能
Provides UDP syslog reception
#KaTeX parse error: Expected 'EOF', got '#' at position 15: ModLoad imudp #̲UDPServerRun 514 允许514端口接收使用UDP协议转发过来的日志
Provides TCP syslog reception
#KaTeX parse error: Expected 'EOF', got '#' at position 15: ModLoad imtcp #̲InputTCPServerRun 514允许514端口接收使用TCP协议转发过来的日志
GLOBAL DIRECTIVES
#全局指令，
Where to place auxiliary files
$WorkDirectory /var/lib/rsyslog
Use default timestamp format 定义日志格式默认模板
$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat
File syncing capability is disabled by default. This feature is usually not required,
not useful and an extreme performance hit
#$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
$IMJournalStateFile imjournal.state
RULES
#规则
Log all kernel messages to the console.
Logging much else clutters up the screen.
#kern.* /dev/console
关于内核的所有日志都放到/dev/console(控制台)
Log anything (except mail) of level info or higher.
Don’t log private authentication messages!
*.info;mail.none;authpriv.none;cron.none /var/log/messages
记录所有日志类型的info级别以及大于info级别的信息到/var/log/messages，但是mail邮件信息，authpriv验证方面的信息和cron时间任务相关的信息除外
The authpriv file has restricted access.
authpriv.* /var/log/secure
authpriv验证相关的所有信息存放在/var/log/secure
Log all the mail messages in one place.
mail.* -/var/log/maillog
邮件的所有信息存放在/var/log/maillog; 这里有一个-符号, 表示是使用异步的方式记录, 因为日志一般会比较大
Log cron stuff
cron.* /var/log/cron
计划任务有关的信息存放在/var/log/cron
Everybody gets emergency messages
.emerg :omusrmsg:
记录所有的大于等于emerg级别信息, 以wall方式发送给每个登录到系统的人
Save news errors of level crit and higher in a special file.
uucp,news.crit /var/log/spooler
记录uucp,news.crit等存放在/var/log/spooler
uucp –unix to unix copy, unix主机之间相关的通讯，news –新闻组
Save boot messages also to boot.log
local7.* /var/log/boot.log
启动的相关信息
begin forwarding rule
转发规则
The statement between the begin … end define a SINGLE forwarding
rule. They belong together, do NOT split them. If you create multiple
forwarding rules, duplicate the whole block!
Remote Logging (we use TCP for reliable delivery)
An on-disk queue is created for this action. If the remote host is
down, messages are spooled to disk and sent when it is up again.
#KaTeX parse error: Expected 'EOF', got '#' at position 30: …eName fwdRule1 #̲ unique name pr…ActionQueueMaxDiskSpace 1g # 1gb space limit (use as much as possible)
#KaTeX parse error: Expected 'EOF', got '#' at position 30: …eOnShutdown on #̲ save messages …ActionQueueType LinkedList # run asynchronously
#$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
@@表示通过tcp协议发送，使用TCP协议转发到remote-host的514(默认)端口
@表示通过udp进行转发
### end of the forwarding rule
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原文链接：https://blog.csdn.net/zhouzhouruirui/article/details/84378465