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Showing posts from July 7, 2019

Nodejs SSA learnings

nodejs-akamai-page.MD Overview In almost every blog when people talk about deploying something on K8S they use node mostly because setting up http server is not that easy. I wish that it could be this easy for our case, (which it wasn’t). Manly because the way we wanted the application to work, plans for SEO and multiple data pipelines for business including Amplitude for client and Pubsub for application and business metrics. Making all these calls from nodejs was easy for developers just 1 more promise. Everything went smoothly as long as functional testing was required. We were ready to launch and somebody from SRE/Devops team asked: “Have you done load testing?” . Everything was superb up to this point where load testing results are required to make service live. Load Testing We started to put load to our services using apache benchmark. Very soon we realised our application is not scaling as much as we expected. To our surprise application was able to handle only 3 requ...
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Sent mail from perl

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 sub Mail_Mailer { my $destination_directory = '/data/' ; my $from_address = "abc@gmail.com" ; my $to_address = "abc@gmail.com" ; my $subject = "SOFT DATA " ; my $body = "Dear Sir\nPlease find the complete set of data on sftp\n." ; my $cc = "test@gmail.com" ; opendir (DES, $destination_directory ); my @files = readdir (DES); close (DES); my @mail_sent_file = @file ; foreach my $mail_file_names ( @mail_sent_file ) { $body = $ {body} . "\n" . $mail_file_names . "\n" ; } $body = $ {body} . "\nRegards\nreportsadmin." ; my $mailer = Mail:: Mailer -> new ( "sendmail" ) or die ; $mailer -> open ( { From => $from_address , To => $t...
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Popular posts

Hubot and Hipchat

Many of us have struggle with concept of L1, and L2 support and maintenance which can be very expensive and transitioning is a living hell. What we wish is the ability for both of them to work together and make a smooth transition. So I have started to think it would be cool to make this happen for a organization which runs 1200+ servers and have teams to support product and infra both. The Idea was to start with collaboration between teams which can be extended to request and support basis. To extend it further we discovered  that product team works for 24x7 and infra team is 18x7. Now it is important to design it in a way that product team can manage it 24x7 with minimum and no help from infra team(L2).  Solution: Solution was to use a collaboration tool which supports API for our tools to maintain alert level. For that please refer my previous blog describing configuration of Icinga and Hipchat. Next logical step is to configure hipchat to support robot system ...
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Helm generic springboot templates

With the dramatically increasing demand for container orchestration specifically Kubernetes, demand to template K8S manifests(Json/Yaml) also came to light. To handle increasing manifests, new CRDs(Custom resource definition), etc… it became obvious that we need a package manager somewhat like yum, apt, etc… However, the nature of Kubernetes manifest is very different than what one used to have with Yum and Apt. These manifests required a lot of templates which is now supported by Helm, a tool written in GoLang with custom helm functions and pipelines. Neutral background on templating Templating has been a driver for configuration management for a long time. While it may seem trivial for users coming from Ansible, Chef, Puppet, Salt, etc…, it is not. Once one moves to Kubernetes, the very first realization is hard declarative approach that Kubernetes follows. It is difficult to make generic templating with declarative form since each application may have some unique feature and r...
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Istio multicluster, gotchas ....

istio.md Istio lets you connect, secure, control, and observe services. At a high level, Istio helps reduce the complexity of these deployments, and eases the strain on your development teams. It is a completely open source service mesh that layers transparently onto existing distributed applications. It is also a platform, including APIs that let it integrate into any logging platform, or telemetry or policy system. Istio’s diverse feature set lets you successfully, and efficiently, run a distributed microservice architecture, and provides a uniform way to secure, connect, and monitor microservices. In context of Vuclip istio allows us to reduce the code and environment configurations while keeping the similar or more feature sets at our disposal. Since istio is designed to bridge the gap for both development teams and SRE, it is essential to see and visualize that in practice. Istio will affect us in our ability to connect , secure(HTTPs TLS, mtls [Phase-2]), control(external comm...
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Read a File line by line in Shell

I've used a few techniques for this kind of reading but gets failed until I've read this fine blog . http://www.bashguru.com/2010/05/how-to-read-file-line-by-line-in-shell.html this helps a lot and i have developed a trick for me. Refer to the following example to examine the script : #!/bin/bash #SCRIPT: method2.sh #PURPOSE: Process a file line by line with redirected while-read loop . FILENAME=$1 count=0 while read LINE do let count++ echo "$count $LINE" done < $FILENAME echo -e "\nTotal $count Lines read" I have passed the file in the end of the loop so i didn't need  to use pipe that is why i process the file in fastest manner and gives  the required output in a quick manner. However i can use one more thing the File Descriptors. The File Descriptors are similar to the normal file pointers however in  more analogue way.If you have used C then you will have familier with the  the default file openers in C "st...
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