{"id":1817,"date":"2019-08-07T08:13:06","date_gmt":"2019-08-07T08:13:06","guid":{"rendered":"https:\/\/www.testpreptraining.com\/tutorial\/?page_id=1817"},"modified":"2020-05-02T06:50:09","modified_gmt":"2020-05-02T06:50:09","slug":"high-availability","status":"publish","type":"page","link":"https:\/\/www.testpreptraining.ai\/tutorial\/aws-sysops-administrator-associate\/high-availability\/","title":{"rendered":"HIGH AVAILABILITY"},"content":{"rendered":"\n<ul class=\"wp-block-list\"><li>Availability is <ul><li>period\nof time when a service is available<\/li><\/ul><ul><li>time\nrequired by a system to respond to a request made by a user.<\/li><\/ul><\/li><li>expressed as % of how much uptime is expected<\/li><li>Example, 99% of availability for one year can\nhave up to 3.65 days of downtime (1%).<\/li><li>High Availability is systems with<ul><li>minimum\ndowntime <\/li><\/ul><ul><li>minimum\nservice interruption<\/li><\/ul><\/li><li>Implement HA by <ul><li>eliminate\nsingle points of failure in your infrastructure<\/li><\/ul><ul><li>putting\nredundant components for same task <\/li><\/ul><ul><li>adding\nthe load balancer above it, to detect failures and adapt for timely recovery<\/li><\/ul><\/li><\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Failure Points<\/td><td>AWS Services\/Solution<\/td><\/tr><tr><td>DNS\/Domain Services<\/td><td>Route53<\/td><\/tr><tr><td>Load Balance<\/td><td>Elastic Load Balancing<\/td><\/tr><tr><td>Web\/Application Server<\/td><td>Auto-Scaling<\/td><\/tr><tr><td>Database Servers<\/td><td>Redundant nodes or clustering<\/td><\/tr><tr><td>Authentication<\/td><td>Redundant nodes<\/td><\/tr><tr><td>Data Center Failures<\/td><td>Use Multiple Availability Zone<\/td><\/tr><tr><td>Disaster<\/td><td>Use Multiple Regions<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Availability is period of time when a service is available time required by a system to respond to a request made by a user. expressed as % of how much uptime is expected Example, 99% of availability for one year can have up to 3.65 days of downtime (1%). High Availability is systems with minimum&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":383,"menu_order":53,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[321],"class_list":["post-1817","page","type-page","status-publish","hentry","category-amazon-aws","tag-high-availability"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>HIGH AVAILABILITY - Testprep Training Tutorials<\/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:\/\/www.testpreptraining.ai\/tutorial\/aws-sysops-administrator-associate\/high-availability\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"HIGH AVAILABILITY - Testprep Training Tutorials\" \/>\n<meta property=\"og:description\" content=\"Availability is period of time when a service is available time required by a system to respond to a request made by a user. expressed as % of how much uptime is expected Example, 99% of availability for one year can have up to 3.65 days of downtime (1%). 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