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cheatsheet-varnish-load-balancing.sla
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<ITEXT CH="Varnish Load Balancing"/>
<para PARENT="h1"/>
<ITEXT CH="Use the built-in directors provided by Varnish to create load balancers."/>
<para/>
<ITEXT CH="They come with various strategies to adapt to your needs"/>
<para/>
<ITEXT CH="How to declare a director"/>
<para PARENT="h2"/>
<ITEXT CH="director dir1 round-robin {"/>
<para PARENT="p.code"/>
<ITEXT CH=" { .backend = web1; }"/>
<para PARENT="p.code"/>
<ITEXT CH=" { .backend = web2; }"/>
<para PARENT="p.code"/>
<ITEXT CH="}"/>
<para PARENT="p.code"/>
<ITEXT CH="set req.backend = dir1;"/>
<para PARENT="p.code"/>
<ITEXT CH="Directors names and their strategies"/>
<para PARENT="h2"/>
<ITEXT CH="fall_back"/>
<tab/>
<tab/>
<ITEXT CH="Uses only one healthy backend at a time "/>
<para/>
<ITEXT CPARENT="p.code" CH="random"/>
<tab/>
<tab/>
<ITEXT CH="Picks a backend randomly"/>
<para/>
<ITEXT CPARENT="p.code" CH="client"/>
<tab/>
<tab/>
<ITEXT CH="Picks a backend using a method defined by admin (ex: IP)"/>
<para/>
<ITEXT CPARENT="p.code" CH="round_robin"/>
<ITEXT CH=" "/>
<tab/>
<ITEXT CH="Picks backends one after the other in order"/>
<para/>
<ITEXT CPARENT="p.code" CH="dns"/>
<tab/>
<tab/>
<ITEXT CH="Defines a pool of backends based on IP range or"/>
<breakline/>
<tab/>
<tab/>
<ITEXT CH="FQDN. Uses random or round_robin strategy "/>
<para/>
<ITEXT CPARENT="p.code" CH="hash"/>
<ITEXT CH=" *"/>
<tab/>
<tab/>
<ITEXT CH="Picks a backend using the hash of the resource "/>
<para/>
<ITEXT CH="* Only useful if backends are proxies as well"/>
<trail PARENT="notes"/>
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<ITEXT CH="Varnish backends"/>
<nbspace/>
<nbspace/>
<nbspace/>
<nbspace/>
<nbspace/>
<nbspace/>
<nbspace/>
<nbspace/>
<ITEXT FONT="Georgia Italic" CH="Web reverse proxy "/>
<trail PARENT="h1"/>
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<ITEXT CH="Frontend & backends"/>
<para PARENT="h1"/>
<ITEXT CH="Varnish being a reverse proxy, it acts as the Frontend receiving browsers Requests. Depending on the caching, it might transmit these Requests to a number of Backends hosting the web applications."/>
<para/>
<ITEXT CH="Declaring and using a backend"/>
<para PARENT="h2"/>
<ITEXT CH="backend web1 {"/>
<para PARENT="p.code"/>
<ITEXT CH=" .host = "10.5.0.1"; #"/>
<nbspace/>
<ITEXT CH="IP address"/>
<para PARENT="p.code"/>
<ITEXT CH=" .port = "80"; # Port"/>
<para PARENT="p.code"/>
<ITEXT CH=" .connect_timeout = 3s; # TCP SYN ACK time"/>
<para PARENT="p.code"/>
<ITEXT CH=" .first_byte_timeout = 120s; # Webapp initial latency"/>
<para PARENT="p.code"/>
<ITEXT CH=" .between_bytes_timeout = 30s; # Webapp latency"/>
<para PARENT="p.code"/>
<ITEXT CH=" .probe{"/>
<para PARENT="p.code"/>
<ITEXT CH=" .url = "/test.jpg" # Resource to test"/>
<para PARENT="p.code"/>
<ITEXT CH=" .timeout = 60 ms # Maximum time for response"/>
<para PARENT="p.code"/>
<ITEXT CH=" .interval = 1 s #"/>
<nbspace/>
<ITEXT CH="Time between tests"/>
<para PARENT="p.code"/>
<ITEXT CH=" .window = 8 # How many tests to consider"/>
<para PARENT="p.code"/>
<ITEXT CH=" .threshold = 6 # Minimum successful tests in window"/>
<para PARENT="p.code"/>
<ITEXT CH=" }"/>
<para PARENT="p.code"/>
<ITEXT CH="} "/>
<para PARENT="p.code"/>
<ITEXT CH="set req.backend=web1;"/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="Backend health"/>
<para PARENT="h2"/>
<ITEXT CH="Use probes to validate backends are "healthy" ie. responding. "Unhealthy" backends are discarded until they becomes healthy again."/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="Without probes, Varnish will still attempt to use sick backends in order to test if they work. Avoid that."/>
<para PARENT="Default Paragraph Style"/>
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<ITEXT CH="Director for Backend Failover "/>
<para PARENT="h2"/>
<ITEXT CH="director dir1 fallback {"/>
<para PARENT="p.code"/>
<ITEXT CH=" { .backend = web1; }"/>
<para PARENT="p.code"/>
<ITEXT CH=" { .backend = web2; } // used only if web1 is unhealthy."/>
<para PARENT="p.code"/>
<ITEXT CH=" { .backend = www3; } // used only if the only healthy"/>
<para PARENT="p.code"/>
<ITEXT CH="}"/>
<para PARENT="p.code"/>
<ITEXT CH="Director for Backend Load Balancing"/>
<para PARENT="h2"/>
<ITEXT CH="director b2 random {"/>
<para PARENT="p.code"/>
<ITEXT CH=" .retries = 5;"/>
<para PARENT="p.code"/>
<ITEXT CH=" {"/>
<para PARENT="p.code"/>
<ITEXT CH=" .backend = web1;"/>
<para PARENT="p.code"/>
<ITEXT CH=" .weight = 7;"/>
<para PARENT="p.code"/>
<ITEXT CH=" }"/>
<para PARENT="p.code"/>
<ITEXT CH=" {"/>
<para PARENT="p.code"/>
<ITEXT CH=" .backend = web2;"/>
<para PARENT="p.code"/>
<ITEXT CH=" .weight = 3;"/>
<para PARENT="p.code"/>
<ITEXT CH=" }"/>
<para PARENT="p.code"/>
<ITEXT CH="} "/>
<para PARENT="p.code"/>
<ITEXT CH="The weight directive is used to change probabilities."/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="Load Balancing and webapp development"/>
<para PARENT="h1"/>
<ITEXT CH="Using load balancing means your web application should share everything except its own code with other backends"/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="Solutions & Techniques"/>
<para PARENT="h2"/>
<ITEXT CH="Sharing a given type resource in a webapp depends on its size and architecture. Here is a catalog of solutions."/>
<para/>
<ITEXT CH="CDN"/>
<tab/>
<tab/>
<ITEXT CH="Store files in another infrastructure (get / set / purge)"/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="404 LOAD"/>
<tab/>
<tab/>
<ITEXT CH="Loading files locally if absent by polling other backends"/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="LOGSTASH"/>
<tab/>
<ITEXT CH="Server for storing logs remotely"/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="MEMCACHE"/>
<tab/>
<ITEXT CH="Server for storing key-value data"/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="MERGE_LATER"/>
<tab/>
<ITEXT CH="Merging log files from backends at regular times"/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="NFS"/>
<tab/>
<tab/>
<ITEXT CH="Filesystem over network mounting protocol"/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="NOSQL"/>
<tab/>
<tab/>
<ITEXT CH="Family of databases (MongoDB, Redis, Cassandra)"/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="PROD_SCRIPTS"/>
<tab/>
<ITEXT CH="Updating webapps and dependencies automatically "/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="SENTRY"/>
<tab/>
<tab/>
<ITEXT CH="Server for storing application internal logs"/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="SQL"/>
<tab/>
<tab/>
<ITEXT CH="Family of databases (Mysql, Postgresql)"/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="SYSLOG"/>
<tab/>
<tab/>
<ITEXT CH="Server for storing logs"/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="Resources to share"/>
<para PARENT="h2"/>
<ITEXT CH="Sessions"/>
<para PARENT="h3"/>
<ITEXT CH="Sessions represent a large number of small files. Good practice: store as little as possible in sessions."/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="Memcache, Redis, NFS are good solutions"/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="Data"/>
<para PARENT="h3"/>
<ITEXT CH="Data usually represents a large amount of informations with variable levels of fiability needs. "/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="Good solutions: SQL, NOSQL if small errors are acceptable"/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="Logs"/>
<para PARENT="h3"/>
<ITEXT CH="Logs represents large amounts of data with low fiability needs and an "append only" logic."/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="Good solutions: SYSLOG, LOGSTASH, SENTRY, MERGE_LATER"/>
<para/>
<ITEXT CH="Assets"/>
<para PARENT="h3"/>
<ITEXT CH="The assets served by Webapps nowadays depend on their dependencies which might come with their own stylesheets and scripts for example."/>
<para PARENT="Default Paragraph Style"/>
<ITEXT CH="Use PROD_SCRIPTS to make sure backends deliver the right contents"/>
<para/>
<ITEXT CH="Sources"/>
<para PARENT="h1"/>
<ITEXT CH="Load Balancing"/>
<para/>
<ITEXT CH="https://www.varnish-cache.org/trac/wiki/LoadBalancing"/>
<para/>
<ITEXT CH="Backend Polling"/>
<para/>
<ITEXT CH="https://www.varnish-cache.org/trac/wiki/BackendPolling"/>
<trail/>
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<ITEXT CH="Original document available on http://github.com/octopuce/cheatsheet-varnish-caching CC by SA 4.0 "/>
<para PARENT="notes"/>
<PageItemAttributes/>
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<ITEXT FONTSIZE="8" CH="v.20140720"/>
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