日常檢查服務的時候，從portainer那里進去看容器日志的時候，發現右上角出現紅色的感嘆號：Unable to retrieve container logs。
因為之前沒出現過這樣的問題，所以就先上服務器上用命令docker logs -f containerID看日志，發現日志也是動不了，還是停留在某個時間的日志記錄上。
想了一下不應該是服務的日志打印出問題，先照著Google搜索了一遍，發現都沒有跟我的問題相匹配的。因為日志有時能收集顯示，有些日志不可以，應該是跟docker設置的日志引擎有問題。
本來是想整一套EFK的，但是感覺現在日志量還不夠大，所以并沒有修改docker的日志引擎，還是默認的journald
[root@ad-official xiaoxiao]# docker info|grep Logging
WARNING: You're not using the default seccomp profile
Logging Driver: journald
journald的官方文檔上有這么一個說明：
man journald.conf ... RateLimitInterval=, RateLimitBurst= Configures the rate limiting that is applied to all messages generated on the system. If, in the time interval defined by RateLimitInterval=, more messages than specified in RateLimitBurst= are logged by a service, all further messages within the interval are dropped until the interval is over. A message about the number of dropped messages is generated. This rate limiting is applied per-service, so that two services which log do not interfere with each other's limits. Defaults to 1000 messages in 30s. The time specification for RateLimitInterval= may be specified in the following units: "s", "min", "h", "ms", "us". To turn off any kind of rate limiting, set either value to 0. ...
這里寫了默認30秒內只能接收1000條日志，看到這里就能明白了，因為前陣子剛在docker發布了一個單日日志文件大小差不多達到3G的服務，導致到了其他服務的日志也受到了影響，大量的日志被journald丟棄，所以我們修改一下配置就沒有問題了。
打開/etc/systemd/journald.conf文件，將RateLimitBurst從默認的1000修改成5000，根據自己目前的日志輸出量進行調整：
[root@ad-official log]# cat /etc/systemd/journald.conf
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# Entries in this file show the compile time defaults.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See journald.conf(5) for details.
[Journal]
#Storage=auto
#Compress=yes
#Seal=yes
#SplitMode=uid
#SyncIntervalSec=5m
#RateLimitInterval=30s
RateLimitBurst=5000
#SystemMaxUse=
#SystemKeepFree=
#SystemMaxFileSize=
#RuntimeMaxUse=
#RuntimeKeepFree=
#RuntimeMaxFileSize=
#MaxRetentionSec=
#MaxFileSec=1month
ForwardToSyslog=no
#ForwardToKMsg=no
#ForwardToConsole=no
ForwardToWall=no
#TTYPath=/dev/console
#MaxLevelStore=debug
#MaxLevelSyslog=debug
#MaxLevelKMsg=notice
#MaxLevelConsole=info
#MaxLevelWall=emerg
#LineMax=48K
順便將ForwardToSyslog和ForwardToWall設置成no，因為默認是yes，會導致我們清理了journal的日志文件，而Syslog中的沒有清除掉，慢慢的就會將磁盤占滿。
然后重啟一下journald就可以恢復正常使用啦：systemctl restart systemd-journald.service
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。
