{"id":761,"date":"2019-11-30T17:59:29","date_gmt":"2019-11-30T17:59:29","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=761"},"modified":"2019-11-30T18:05:36","modified_gmt":"2019-11-30T18:05:36","slug":"go-logger-rotation","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/go-logger-rotation\/","title":{"rendered":"Go Logger Rotation"},"content":{"rendered":"\n<p class=\"has-medium-font-size\">This article is about how we rotate log files from within the go app without having to worry about the disk full alerts.<\/p>\n\n\n\n<p class=\"has-medium-font-size\">We are going to use <a href=\"https:\/\/github.com\/lestrrat\/go-file-rotatelogs\">https:\/\/github.com\/lestrrat\/go-file-rotatelogs<\/a> for log rotation. <\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Example:<\/strong> In the example below we are setting <\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>MaxAge<\/strong> to 10 seconds. It sets the max-age of a log file before it is purged from the file system. Meaning the file will be deleted after 10 seconds. See<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">rotatelogs.WithMaxAge(time.Second*10)<\/code><\/pre>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>RotationTime <\/strong>is 1 second<strong>. <\/strong>It sets the time when the file will be rotated. So the file will be rotated every second. See <\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">rotatelogs.WithRotationTime(time.Second*1)<\/code><\/pre>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>Location <\/strong>is \/var\/log\/service\/ . See<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">path := \"\/var\/log\/service\/\"<\/code><\/pre>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>Pattern<\/strong> of the file is &#8220;old.UTC..2019-11-30.22:40:10&#8221; . See<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\"> fmt.Sprintf(\"%s.%s\", path, \"%Y-%m-%d.%H:%M:%S\")<\/code><\/pre>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>Link Path <\/strong>is\/var\/log\/service\/current. This file would be a symlink for the actual file. See<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">rotatelogs.WithLinkName(\"\/var\/log\/service\/current\")<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Code:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport (\n    \"fmt\"\n    \"log\"\n    \"time\"\n    rotatelogs \"github.com\/lestrrat\/go-file-rotatelogs\"\n    \"github.com\/sirupsen\/logrus\"\n)\n\nfunc initiLogger() {\n    path := \"\/var\/log\/service\/old.UTC.\"\n    writer, err := rotatelogs.New(\n        fmt.Sprintf(\"%s.%s\", path, \"%Y-%m-%d.%H:%M:%S\"),\n        rotatelogs.WithLinkName(\"\/var\/log\/service\/current\"),\n        rotatelogs.WithMaxAge(time.Second*10),\n        rotatelogs.WithRotationTime(time.Second*1),\n    )\n    if err != nil {\n        log.Fatalf(\"Failed to Initialize Log File %s\", err)\n    }\n    log.SetOutput(writer)\n    return\n}\n\nfunc main() {\n    initiLogger()\n    for i := 0; i < 100; i++ {\n        time.Sleep(time.Second * 1)\n        log.Printf(\"Hello, World!\")\n    }\n    fmt.Scanln()\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Go to the location \/var\/log\/service\/. You will notice<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Files are rotated every second.<\/li><li>Max age of the file is 10 seconds. So every file will be deleted after 10 seconds.<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>This article is about how we rotate log files from within the go app without having to worry about the disk full alerts. We are going to use https:\/\/github.com\/lestrrat\/go-file-rotatelogs for log rotation&#8230;.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[3,4,95,96],"class_list":["post-761","post","type-post","status-publish","format-standard","hentry","category-tech","tag-go","tag-golang","tag-logger","tag-rotate"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Go Logger Rotation - Welcome To Golang By Example<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/golangbyexamples.com\/go-logger-rotation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Go Logger Rotation - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"This article is about how we rotate log files from within the go app without having to worry about the disk full alerts. 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