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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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Managing & Configuring YUM [Centos 6.0]

Yum Configuration Hi Friends, we all have faced problems while configuring yum in RedHat, Fedora and Centos. Please find the below mention steps to use all the RPM packages come along with your distribution. Yum configuration will allow you to use them with proper dependency resolution. To configure yum you must have two packages, 1. yum 2. createrepo To obtain the same do the below mention just after you have mounted you disk. There could be two conditions a.) You have the distribution disk i.e. DVD. Please follow the below mention instructions to manage the same. Your system mush have the greater or equal space of DVD. # df -ah User the partition which has the space and create a directory. In my case /mnt has the space. # mount /dev/dvdwriter /mnt # cd /mnt/Packages/ # rpm -ivh yum-* --nodeps –force # rpm -ivh vsftps* -y # rpm -ivh createrepo* --nodeps --force # cp -rpvf /mnt/* /var/ftp/pub It will create the dump on /var/ftp/pub now we need to unmount the disk. # umount /mnt b.)...
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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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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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A few useful sql functions

Start mysql in Ubuntu without having root privilege:- If you want to use mysql in Ubutu you can use following command which will use a root level privilege   $ mysql -u root -p Enter password: Welcome to the MySQL monitor.  Commands end with ; or \g. Your MySQL connection id is 147 Server version: 5.1.49-1ubuntu8.1-log (Ubuntu) When it demands to enter the password fill it with 'root' and hopefully you'll get logged in .   Last_insert_id():- (with no argument) returns the first automatically generated value that was set for an AUTO_INCREMENT column by the most recently executed INSERT statement to affect such a column. For example, after inserting a row that generates an AUTO_INCREMENT value, you can get the value like this:   mysql> SELECT LAST_INSERT_ID(); Database():- Database() method returns the current selected database and you can use it in your communication and your queries. The syntax is :   mysql>select Database (); User():- It a...
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Add user in Sudoer file

The command sudo provides other users to run a command as a root. To use sudo user must have their level of privilege in /etc/sudoer file. In some cases this file is set for read only and others can edit that file and add their user name in Sudoer for this case such as Fedora 12 users need to provide this syntax as a root on their terminal. Syntax for adding a user in Sudoer file is: echo "username ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers And to gain the writing privilege you can use the following code in your terminal : chmod 755 /etc/sudoers This code will be enough to give permissions to the user and his user group. If you are an ubuntu user you can easily add your user in this file like: vi /etc/sudoers And you will get a text file. Afterward you need to press 'i' for edit and edit by adding your username just below "root ALL=(ALL) ALL" "username ALL=(ALL) ALL"
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