由於網絡及安全設備等存儲空間很小，導致日誌存儲時間不足，因此需要搭建rsyslog日誌服務器。此日誌服務器爲簡約版，僅僅以文件方式存儲日誌。
一、搭建目標：
日誌文件存放在/var/log文件夾下，每天按日期創建日誌文件夾。`
二、測試環境：
服務端：Centos7 和中標麒麟V7.4版本下測試成功。
客戶端：華三45xx交換機、華爲2700交換機、銳捷20-X路由器、銳捷78xx交換機、網禦漏掃均能正常上報debug日誌。
編輯服務端的/etc/rsyslog.conf文件
注意下中文註釋地方
# 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 #** 引用udp協議的模塊**
$UDPServerRun 514 # **設置udp協議使用端口**
# Provides TCP syslog reception
$ModLoad imtcp # **引用tcp協議的模塊**
$InputTCPServerRun 514 #** 設置tcp協議使用端口**
#### GLOBAL DIRECTIVES ####
# Where to place auxiliary files
$WorkDirectory /var/lib/rsyslog
# Use default timestamp format
$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat
$template Remote,"/var/log/%$YEAR%-%$MONTH%-%$DAY%/%fromhost-ip%.log" # ****設置遠程日誌存放路徑和文件格式****
:fromhost-ip, !isequal, "127.0.0.1" ?Remote #** 如果是本機日誌則不記錄**
# 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
$IMJournalStateFile imjournal.state
#### RULES ####
# Log all kernel messages to the console.
# Logging much else clutters up the screen.
# **關於內核的所有日誌都放到/dev/console(控制檯)**
#kern.* /dev/console
# Log anything (except mail) of level info or higher.
# Don't log private authentication messages!
# 記錄所有日誌類型的info級別以及大於info級別的信息到/var/log/messages，但是mail郵件信息，authpriv驗證方面的信息和cron時間任務相關的信息除外
*.info;mail.none;authpriv.none;cron.none /var/log/messages
# The authpriv file has restricted access.
# authpriv驗證相關的所有信息存放在/var/log/secure
authpriv.* /var/log/secure
# Log all the mail messages in one place.
# 郵件的所有信息存放在/var/log/maillog; 這裏有一個-符號, 表示是使用異步的方式記錄, 因爲日誌一般會比較大
mail.* -/var/log/maillog
# Log cron stuff
# 計劃任務有關的信息存放在/var/log/cron
cron.* /var/log/cron
# Everybody gets emergency messages
# 啓動的相關信息
*.emerg :omusrmsg:*
# Save news errors of level crit and higher in a special file.
uucp,news.crit /var/log/spooler
# Save boot messages also to boot.log
local7.* /var/log/boot.log
# ### begin forwarding rule ###
# The statement between the begin ... end define a SINGLE forwarding
# rule. They belong together, do NOT split them. If you create multiple
# forwarding rules, duplicate the whole block!
# Remote Logging (we use TCP for reliable delivery)
#
# An on-disk queue is created for this action. If the remote host is
# down, messages are spooled to disk and sent when it is up again.
#$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 ###```
三、重啓rsyslog
systemctl restart rsyslog
systemctl status rsyslog # 必須查看rsyslog是否正常啓動（很多按網上的問價格配置完後，查看狀態會提示沒有權限創建文件夾或文件信息，那此文檔就不能使用）
查看監聽端口
netstat -antup |grep 514
[root@localhost ~]# netstat -uanp|grep rsyslog
tcp 0 0 0.0.0.0:514 0.0.0.0: LISTEN 20228/rsyslogd
tcp 0 0 :::514 ::: LISTEN 20228/rsyslogd
udp 0 0 0.0.0.0:514 0.0.0.0: 20228/rsyslogd
udp 0 0 :::514 ::: 20228/rsyslogd*
四、關閉防火牆
systemctl stop firewalld #根據各自系統命令關閉防火牆
systemctl disable firewalld
systemctl status firewalld
五、查看日誌
cd /var/log
ll
六、客戶端配置（可供參考）
華爲設備syslog配置：
info-center loghost source Vlanif1
info-center loghost 1.1.1.1 #日誌服務地址
華三設備syslog配置：
info-center loghost source Vlan-interface30
info-center loghost 1.1.1.1 #日誌服務地址
銳捷設備syslog配置：
logging enable
logging trap debugging #銳捷debugging級別就是7，爲所有日誌
logging source interface GigabitEthernet 0/2
logging server 1.1.1.1 #日誌服務地址
以上部分內容參考此鏈接：
https://note.guotianyu.cn/linux/centos7-rsyslog.html