\ncalculate the number of hits on the website, you can find the code at
\nGithub<\/a><\/p>\n
The setup was to add an Nginx container as a load balancer at the
\nfront-end to serve two back-end Node application containers, and then
\nhave the two Node servers connect to a MongoDB database container. In
\nthis setup I will use 5 machines from Digital Ocean, 4 to build the
\napplication stack with the highest availability, and the 5th as a
\nRancher server.<\/p>\n
![\"nodejs_app.png\"](\"https:\/\/lh5.googleusercontent.com\/dnKNEKSUa9aIPnxj5TaVd1WNcasSrNRoyX-4Rc16IJqoFgamAZoB4Fgwr3xLD_b3nU736fY2syfynDv7-MuEwopA2p6cFsk3mMAn1432zxAVr_td3ekxrY6beDhwn-ychL0\")
[]Set Up A Rancher Server<\/h3>\n
On a Digital Ocean machine with Docker 1.4 installed we will apply the
\nfollowing command to set up a Rancher platform on the port 8000:<\/p>\n
root@Rancher-Mngmt:~# docker run -d –name rancher-server -p 8080:8080 rancher\/server<\/p>\n
The previous command will run a docker instance with rancher platform,
\nand proxy the port 8080 on the instance to the same port on the Digital
\nOcean machine. To make sure that the server is running type this
\ncommand:<\/p>\n
root@Rancher-io-Mngmt:~# docker logs rancher-server<\/p>\n
You should see something like the following output:<\/p>\n
20:02:41.943 [main] INFO ConsoleStatus – [DONE ] [68461ms] Startup Succeeded, Listening on port 8080<\/p>\n
To access Rancher now, type the following url in your browser:<\/p>\n
http:\/\/DO-ip-address:8080\/<\/a> To register the Digital Ocean machines with docker 1.4 installed with root@Rancher-Test-Instance-X# docker run -it –privileged -v \/var\/run\/docker.sock:\/var\/run\/docker.sock rancher\/agent http:\/\/rancher-server-ip:8080<\/p>\n where rancher-server-ip is the ip address of the After applying the previous command on each machine you should see If you are familiar with Ansible as a configuration management [DO] $ ansible DO -u root -a \u201cdocker run -it –privileged -v \/var\/run\/docker.sock:\/var\/run\/docker.sock rancher\/agent http:\/\/rancher-server-ip:8080\u201d<\/p>\n After Registering the 4 machines with Rancher, its time to start The node.js<\/em> application will calculate the number of hits on a The Dockerfile will be like the following:<\/p>\n FROM ubuntu:14.04 The previous Docker file is really simple, lets explain it line by RUN apt-get -qq update && apt-get -yqq upgrade<\/p>\n RUN apt-key adv –keyserver hkp:\/\/keyserver.ubuntu.com:80 –recv 7F0CEB10 RUN apt-get update && apt-get install -yqq mongodb-org<\/p>\n ADD run.sh \/tmp\/run.sh ENTRYPOINT [“\/bin\/bash”, “\/tmp\/run.sh”]<\/p>\n Let\u2019s take a look at the run.sh file:<\/p>\n #!\/bin\/bash The server started first to be able to import the init.json database to The init.json database file:<\/p>\n The Node.js container will install node.js<\/em> and git<\/em> packages, and FROM ubuntu:14.04 # Install node # Run The App The ENTRYPOINT of the Docker container is executing the MONGO_DN=mongo # Fetch the application # Run the Application The previous script will check for the MONGO_IP environment variable and if it is set, it will add the content of The Dockerfile of the Nginx container will install nginx webserver and Nginx Dockerfile:<\/p>\n #dockerfile for nginx\/nodejs # Install nginx # Adding the configuration files # Expose the port 80 # Run nginx The Dockerfile is very simple and use the same commands like the run.sh:<\/p>\n NODE_1_DN=node_app1 Since we are using two Node application servers, we need to proxy the The ips of the Node.js containers are defined by the two environment Now for the final step, build and then push the images to Docker ~\/rancher_vm# docker build -t husseingalal\/nodeapp_mongo mongo\/ Now Docker will ask you for your account credentials, then the images Note that the option \u201cManage Network on docker0<\/em>\u201c After clicking Create, you should see that the machine is started to Note that we used the Node.js image we just created, before creating After that click Create to begin the creation process of the Node.js Since the nginx instance will be facing the internet, we should proxy We need also to add the ips of the two Node.js application servers Now wecan access the application using the ip address of the Host In part 1 of this series, I created a Node.js application stack using In part 2<\/a> If you\u2019d like to learn more about Rancher, please schedule a Hussein Galal is a Linux System Administrator, with experience in
\nyou should see something like the following:<\/p>\n![\"rancher-mngmt.png\"](\"https:\/\/lh5.googleusercontent.com\/zRFk1ILDTclMyv7G_f4Jn_iGzM8zA770EDAlc_ZHeG5Qs1t3u3a-1ou9oyUCzdlWRAxcLaXrgxh-_4YtBiQAlxyUQwq60N5ejX3aGeF9NQFtKt9UR4W_lOschEjVHhoM6OQ\")
[]Register Digital Ocean\u2019s instances With Rancher<\/h3>\n
\nRancher, type the following on each machine:<\/p>\n
\nRancher server we just installed, or you can click on \u201cRegister a New
\nHost \u201c on Rancher platform and copy the command shown.<\/p>\n![\"registernewhost.png\"](\"https:\/\/lh3.googleusercontent.com\/zoQbH4nK07-6KFMRzg9x8vKR_tgJimMxTj1JtpKeoP0vvagxFsfwMxYsWZbp7nePA3A1B3SZFE-W-ccLNdmuf8yKiOGH0UHr716hxhNJ57qrSTluYHtqIYSk0zb4xTQxSNk\")
\nsomething like the following when you access the Rancher management
\nserver:<\/p>\n![\"RInstances.png\"](\"https:\/\/lh4.googleusercontent.com\/-1q82MEPpbierVEIcw7buNUefzm7w8TyOazCl2YbHZqCXdY3Ei6gh3iZr2GEef9w7w88Gh9GgrdFnXKZKZHY5Ne06XHIvbg7bzNzAZVMkJYceyDXyNeTlwg4xZuNKlpq57c\")
\ntool, you can use it to register the Digital Ocean machines with Rancher
\nin one command:<\/p>\n\n
\n\/etc\/ansible\/hosts under one group name:<\/li>\n<\/ul>\n
\n178.62.101.243
\n178.62.27.24
\n178.62.98.242
\n178.62.11.154<\/p>\n\n
\nonce:<\/li>\n<\/ul>\nMongoDB Docker Container<\/h3>\n
\nbuilding our application stack.<\/p>\n
\nwebsite, so it needs to store this data somewhere. I will use MongoDB<\/em>
\ncontainer to store the number of hits.<\/p>\n
\nMAINTAINER hussein.galal.ahmed.11@gmail.com
\nENV chached_FLAG 0
\nRUN apt-get -qq update && apt-get -yqq upgrade
\nRUN apt-key adv –keyserver hkp:\/\/keyserver.ubuntu.com:80 –recv 7F0CEB10
\nRUN echo ‘deb http:\/\/downloads-distro.mongodb.org\/repo\/ubuntu-upstart dist 10gen’ | tee \/etc\/apt\/sources.list.d\/10gen.list
\nRUN apt-get update && apt-get install -yqq mongodb-org
\nRUN mkdir -p \/data\/db
\nEXPOSE 27017
\nADD run.sh \/tmp\/run.sh
\nADD init.json \/tmp\/init.json
\nENTRYPOINT [“\/bin\/bash”, “\/tmp\/run.sh”]<\/p>\n
\nline:<\/p>\n\n
\n
\nRUN echo ‘deb http:\/\/downloads-distro.mongodb.org\/repo\/ubuntu-upstart dist 10gen’ | tee \/etc\/apt\/sources.list.d\/10gen.list<\/p>\n\n
\nclient:<\/li>\n<\/ul>\n\n
\n
\nMongoDB:<\/li>\n<\/ul>\n\n
\n
\napplication.<\/li>\n
\nMongoDB server and ran the server.<\/li>\n<\/ul>\n
\nADD init.json \/tmp\/init.json<\/p>\n\n
\nexecuting the run.sh file:<\/li>\n<\/ul>\n
\n\/usr\/bin\/mongod &
\nsleep 3
\nmongoimport –db countdb –collection hits –type json –file \/tmp\/init.json
\n\/usr\/bin\/mongod –shutdown
\nsleep 3
\n\/usr\/bin\/mongod<\/p>\n
\nthe countdb database and hits collection, then shutdown the server and
\nstart it up again but in the foreground this time.<\/p>\nNode.js Application Container<\/h3>\n
\nthen will run a simple script to update the \/etc\/hosts file with the ip of the MongoDB container provided by the
\nenvironment variable: $MONGO_IP.<\/p>\n
\nMAINTAINER hussein.galal.ahmed.11@gmail.com
\nENV CACHED_FLAG 1<\/p>\n
\nRUN apt-get update -qq && apt-get -y upgrade
\nRUN apt-get install -yqq nodejs git git-core
\nVOLUME [ “\/var\/www\/nodeapp” ]
\nADD .\/run.sh \/tmp\/run.sh# Install Dependencies
\nWORKDIR \/var\/www\/nodeapp<\/p>\n
\nENTRYPOINT [“\/bin\/bash”, “\/tmp\/run.sh”]<\/p>\n
\n\/tmp\/run.sh script:<\/p>\n
\nif [ -n “$MONGO_IP” ]
\nthen
\necho “$MONGO_IP $MONGO_DN” >> \/etc\/hosts
\nfi<\/p>\n
\ngit clone https:\/\/github.com\/galal-hussein\/hitcntr-nodejs.git
\nmv hitcntr-nodejs\/* .
\nrm -rf hitcntr-nodejs<\/p>\n
\nnodejs index.js<\/p>\n
\nthis variable to \/etc\/hosts, then pull the code from
\nGithub Repo, and finally run the node application.<\/p>\nNginx Container<\/h3>\n
\nadd the configuration files, and ran a script to update \/etc\/hosts file
\nlike the Node.js container, and finally run the web server.<\/p>\n
\nFROM ubuntu:14.04
\nMAINTAINER hussein.galal.ahmed.11@gmail.com
\nENV CACHED_FLAG 0<\/p>\n
\nRUN apt-get update -qq && apt-get -y upgrade
\nRUN apt-get -y -qq install nginx<\/p>\n
\nADD conf\/nginx.conf \/etc\/nginx\/nginx.conf
\nADD conf\/default \/etc\/nginx\/conf.d\/default
\nADD .\/run.sh \/tmp\/run.sh<\/p>\n
\nEXPOSE 80<\/p>\n
\nENTRYPOINT [ “\/bin\/bash”, “\/tmp\/run.sh” ]<\/p>\n
\nprevious images.<\/p>\n
\nNODE_2_DN=node_app2
\nif [ -n “$NODE_APP1_IP” ]
\nthen
\necho “$NODE_APP1_IP $NODE_1_DN” >> \/etc\/hosts
\nfi
\nif [ -n “$NODE_APP2_IP” ]
\nthen
\necho “$NODE_APP2_IP $NODE_2_DN” >> \/etc\/hosts
\nfi
\n# Run Nginx
\n\/usr\/sbin\/nginx<\/p>\n
\nhttp requests received by Nginx to those servers and to do that we need
\nto add the ips of the Node.js containers to the hosts file.<\/p>\n
\nvariables (NODE_APP1_IP, and NODE_APP2_IP).<\/p>\nBuild And Push The Images<\/h3>\n
\nhup:<\/p>\n
\n~\/rancher_vm# docker build -t husseingalal\/nodeapp_node node\/
\n~\/rancher_vm# docker build -t husseingalal\/nodeapp_nginx nginx\/
\n~\/rancher_vm# docker push husseingalal\/nodeapp_mongo
\n~\/rancher_vm# docker push husseingalal\/nodeapp_node
\n~\/rancher_vm# docker push husseingalal\/nodeapp_nginx<\/p>\n
\nwill be pushed to the Docker hub to be used later with Rancher.<\/p>\nSet Up The Application Stack<\/h3>\n
\n
\nusing the MongoDB image we just created:<\/li>\n<\/ol>\n![\"Rmongo1.png\"](\"https:\/\/lh3.googleusercontent.com\/4HsOfniVS0ZTDfdROeiA8vlEGlfTCpI5GseBhTSymY0E_t6fb3T1HzaFm3HFQf2oaAEtJ8jk-Qb4UM2uAUKFBRY6lc5-pWinWIjxAj0gze4_lIq6XwuYhLsP_cno5jFAkK8\")
\nwas chosen to make sure that we will enable one of the unique features
\nof Rancher which is cross container networking, this feature enables
\nDocker containers on different hosts to communicate in a virtual private
\nnetwork.<\/p>\n
\ndownload the image and install it along with another docker instance
\ncalled Network Agent which is used to create the virtual private network
\nwe just talked about.<\/p>\n![\"RMongo2.png\"](\"https:\/\/lh3.googleusercontent.com\/kHYcXVzfQe138VMOlC8aXvYa_4Z3Q1T4JQS1dquuNJGpgwfAK3_1T51voExh9urysGTCjk7jJ4TqBeZmp2UraULL2SRA7SccQYhRtfwgKzxivmnF1ohGGUYSIuDS9EhigUE\")
\n
\nwhich are connected to the MongoDB database:<\/li>\n<\/ol>\n![\"Rnode1_1.png\"](\"https:\/\/lh4.googleusercontent.com\/F6dJHYr-1p3nUHlKj82K2fU1AyKbTzYYQLgoGXjZtUAdCShcDLN3JcoJojkqEdVNa0BOxoaBXKYbsYVGLb4GJOr2hvw1ajGKgcdBZPpSL5Pj5UVfYPzjHCvBryHoSA6e_5E\")
\nthe container make sure to add the MONGO_IP environment variable to add the ip of the MongoDB server, you can
\nget the private ip of the MongoDB server from the Rancher panel:<\/p>\n![\"Rnode1_2.png\"](\"https:\/\/lh3.googleusercontent.com\/KjO9RWdy5vEAJfvg4szaQLNuyaZ2wg2k6mjZTFaA416bnAo1nn02IbR-_3qXkmK607OUSjIRcBaHJE_Y1G6obmrjSHOoxOUUwjTtVhqLkVXIroiwV5_3WmkqkVL-kdzXxZA\")
\ncontainer. On the second host create the second Node.js Application
\ncontainer using the same steps.<\/p>\n\n
\nlast host:<\/li>\n<\/ol>\n![\"Rnginx1.png\"](\"https:\/\/lh4.googleusercontent.com\/wSz3wKt-xYu1ujdqUjdkWeXFZRfEJr-TLEGcTa7uVNZrKagWPcujJbiOUs04K8vHl_k_0u2bcA-1kldAtbZGHIlUxzNgBIgZMfW6d-uaMyiScZrPZ44HQ21_RzerPIA-LyI\")
\nthe port 80 from inside the container to the port 80 of the Digital
\nOcean machine:<\/p>\n![\"Rnginx2.png\"](\"https:\/\/lh5.googleusercontent.com\/HeoAdbCLetBCgntJr9Lz3l1XOe9wMwdIsmDNFWPGKprQYLmcdPKOdN7ccH22XeB47BKJ0t4T1jWPslDe6FAy4HgSgdir-DamtjnU1sCRRBP3EO1bmYB-DpIQpvzgCYBX2Mw\")
\nwhich are connected to Nginx, you can add the ips through creating two
\nenvironment variables (NODE_APP1_IP, NODE_APP2_IP):<\/p>\n![\"Screenshot](\"https:\/\/lh5.googleusercontent.com\/O20hzjE5ueo1zag69L0oJAhkEbKxHsHVUc1yVFE5LR8o8xU9rtR_b8Yu2DZEQMtfRxaiDQh3ua63_gRnfoqQa0fkHiJ_MtfSNqdt_L_Idji5gLcZD5mu3StgDj_HTargJgw\")
\nmachine http:\/\/<the-ip-address>.<\/p>\n![\"Rsuccess.png\"](\"https:\/\/lh5.googleusercontent.com\/A0kAWavgsbwm6kIegGGIq3D_PD2x-Q1DzE4z4g_n7UU1Lx05w2t2nGefungSotkNJhPcFlnEh12MJxjqy1cdO8Yo8NuE3pyonGr0gi2Gk_MhCFJXNJHEciSTm9Z_WX2JHqs\")
Conclusion<\/h3>\n
\nDocker containers and Rancher platform. The stack consists of Nginx
\ncontainer which balances the load between two Node.js application
\ncontainers and using MongoDB as our database.<\/p>\n
\nI introduce one of the newest features of Rancher: Github
\nAuthentication, also I will use Github WebHooks feature for automatic deployment of the web application.<\/p>\n
\ndemo:<\/p>\n
\nLinux, Unix, Networking, and open source technologies like Nginx,
\nApache, PHP-FPM, Passenger, MySQL, LXC, and Docker. You can follow
\nHussein
\non Twitter @galal_hussein<\/a>.*<\/p>\n