电子说
查看服务器、应用运行日志,这是每个程序员必备的工作技能,因为,日志是最好的查找出错问题在哪的途径。如果当服务器爆了,你却连如何定位错误都不知道?那么,这锅你是背定了。。。
今天,我们就针对大量日志记录中,如何快速定位错误?来聊一聊。
动态查看日志
tail -f catalina.ou
从头打开日志文件
cat catalina.ou
可以使用 >nanjiangtest.txt
输出某个新日志去查看
[root@yesky logs]# cat -n catalina.out |grep 717892466 >nanjiangtest.txt
[root@yesky logs]# tail -n number catalina.out 查询日志尾部最后number行的日志
[root@yesky logs]# tail -n +number catalina.out 查询number行之后的所有日志
[root@yesky logs]# head -n number catalina.out 查询日志文件中的前number行日志
[root@yesky logs]# head -n -number catalina.out 查询日志文件除了最后number行的其他所有日志
用grep拿到的日志很少,我们需要查看附近的日志。我是这样做的,首先: cat -n test.log | grep “关键词”
得到关键日志的行号
[root@yesky logs]# cat -n catalina.out |grep 717892466
13230539 [11:07 1711] INFO nanjiang:Edit Old Article:717892466-2020-11-07 1711
13230593 [11:07 1715] INFO nanjiangSave Article ID IS:717892466
13230595 717892466 article.getDisplayTime()1 = 2020-11-07 1611
13230596 717892466 article.getDisplayTime()2 = 2020-11-07 1611
13230601 [11:07 1715] INFO 南江 10.10.10.39 edit article 717892466 编辑文章
「cat -n catalina.out|tail -n +13230539|head -n 10」
tail -n +13230539
表示查询13230539行之后的日志head -n 10
则表示在前面的查询结果里再查前10条记录
[root@yesky logs]# cat -n catalina.out |tail -n +13230539|head -n 10
13230539 [11:07 1711] INFO nanjiang:Edit Old Article:717892466-2020-11-07 1711
13230540 [11:07 1711] INFO Takes:2 ms class com.tmg.cms.manager.dao.article.impl.ArticleContentDaoImpl getListByArticleId [NzE3ODkyNDY2] [int]
13230541 [11:07 1711] INFO Takes:1 ms class com.tmg.cms.manager.dao.resourceImage.impl.ResourceImageDaoImpl load
13230542 [11:07 1711] INFO Takes:0 ms class com.tmg.cms.manager.dao.resourceImage.impl.ResourceImageDaoImpl load
13230543 [11:07 1711] INFO Takes:1 ms class com.tmg.cms.manager.dao.resourceImage.impl.ResourceImageDaoImpl load
13230544 [11:07 1711] INFO article.getImage3:/uploadImages/2020/312/02/3NXCRK4U3589_2.jpg
13230545 [11:07 1711] INFO Takes:0 ms class com.tmg.cms.manager.dao.resourceImage.impl.ResourceImageDaoImpl load
13230546 [11:07 1711] INFO Takes:2 ms class com.tmg.cms.manager.dao.privilege.impl.UserDaoImpl getUserByid
13230547 [11:07 1711] INFO Takes:57 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl selectSitemapWithoutAudit [MQ==] [int]
13230548 [11:07 1711] INFO Takes:5 ms class com.tmg.cms.manager.dao.forbidword.impl.ForbidwordDaoImpl getForbidwordBysiteid [MjI=] [int]
首先要进行范围时间段内日志查询先查看是否在当前日之内存在,
grep '11:07 1820' catalina.out
grep '11:07 1811' catalina.out
时间范围内的查询
sed -n '/11:07 1820/,/11:07 1811/p' catalina.out
sed -n '/11:07 18/,/11:07 18/p' catalina.out
[root@yesky logs]# grep '1175109632' catalina.out | wc -l
154
[root@yesky logs]# tail -n 20 catalina.out | grep 'INFO Takes:1'
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.config.impl.ConfigInfoDaoImpl load
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [NTkwOTQ5] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzI0] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzI3] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzMw] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzA5NA==] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [Mzc4Mg==] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [OTM1MA==] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MTE5MDMw] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [NTQ2MzQw] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [NTg2NzYy] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzYyMjA=] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.configModule.impl.ConfigModuleDaoImpl getPersonMenuList
[root@yesky logs]# tail -n 20 catalina.out | grep 'INFO Takes:1' --color
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.config.impl.ConfigInfoDaoImpl load
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [NTkwOTQ5] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzI0] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzI3] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzMw] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzA5NA==] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [Mzc4Mg==] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [OTM1MA==] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MTE5MDMw] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [NTQ2MzQw] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [NTg2NzYy] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzYyMjA=] [int]
[root@yesky logs]# tail -n 20 catalina.out | grep 'INFO Takes:1' --color -a2
[11:11 2251] INFO Takes:0 ms class com.tmg.cms.manager.dao.article.impl.ArticleContentDaoImpl getArticlePageNum [NzE4MTM2ODky] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.config.impl.ConfigInfoDaoImpl load [com.tmg.cms.manager.model.config.ConfigInfo]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [NTkwOTQ5] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzI0] [int]
[11:11 2251] INFO Takes:0 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzI1] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzI3] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzMw] [int]
[11:11 2251] INFO Takes:0 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzAzNg==] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzA5NA==] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [Mzc4Mg==] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [OTM1MA==] [int]
[11:11 2251] INFO Takes:0 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MTE0MjQ4] [int]
[11:11 2251] INFO Takes:0 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MTE4MDc4] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MTE5MDMw] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [NTQ2MzQw] [int]
[11:11 2251] INFO Takes:0 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [NTQ3MTIw] [int]
[11:11 2251] INFO Takes:0 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [NTY4OTYx] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [NTg2NzYy] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.sitemap.impl.SitemapDaoImpl getSitemapTop [MzYyMjA=] [int]
[11:11 2251] INFO Takes:1 ms class com.tmg.cms.manager.dao.configModule.impl.ConfigModuleDaoImpl getPersonMenuList [com.tmg.cms.manager.model.config.ConfigPersonMenu]
[root@yesky logs]# tail -n 2000 catalina.out | grep 'INFO Takes:1' --color -a2 | more
[root@yesky logs]# tail -n 2000 catalina.out | grep 'INFO Takes:1' --color -a2 | less
ctrl + F
- 向前移动一屏ctrl + B
- 向后移动一屏ctrl + D
- 向前移动半屏ctrl + U
- 向后移动半屏j
- 向前移动一行k
- 向后移动一行G
- 移动到最后一行g
- 移动到第一行q / ZZ
- 退出 less 命令
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