Site Reliability Engineering Cookbook

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Kubernetes || Remove Namespace stuck in terminating state after delete

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Currently, we are getting some issues while deleting the namespace in Kubernetes(AKS). When we run " kubectl delete ns " command, it got stuck and after sometime, if we abort this it will remain in terminating state forever. Below is the kubernetes version we are using- $ kubectl version Client Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.0", GitCommit:"ddf47ac13c1a9483ea035a79cd7c10005ff21a6d", GitTreeState:"clean", BuildDate:"2018-12-03T21:04:45Z", GoVersion:"go1.11.2", Compiler:"gc", Platform:"linux/amd64"} Server Version: version.Info{Major:"1", Minor:"11", GitVersion:"v1.11.5", GitCommit:"753b2dbc622f5cc417845f0ff8a77f539a4213ea", GitTreeState:"clean", BuildDate:"2018-11-26T14:31:35Z", GoVersion:"go1.10.3", Compiler:"gc", Platform:"linux/amd64"} Here, we will see how we ...
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How to take JVM Heap Dump using jmap

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We have different options for taking a heap dump of running JAVA process and then analyze those dump for any kind for memory leak. Today, We are going to do the same using " jmap " in-built utility provided with JDK. Using this you will get an advantage that you don't need to wait untill our JVM got crashed by using passing " -XX:+HeapDumpOnOutOfMemoryError " parameter to JVM process. We can capture current status using jmap as below: 1.) Find out the jmap location(only if your JAVA_HOME variable not defined)       #locate jmap 2.) After finding jmap location, move to that directory and run jmap to get live thread dump.       #./jmap -dump:live,format=b,file=[file location] [pid] For more details and options run the command with help option as below : # ./jmap -help Usage:     jmap [option] <pid>         (to connect to running process)     jmap [option] ...
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How to reset mongodb rootadmin password ??

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Sometimes we have to manage credentials for lots of things and its obvious that we can forget one of them. Here I am going to explain that how we can reset "rootadmin" password for running mongodb replica set. I am not going in details about installation, configuration or functionality detail. Instead, I'll directly jump to actual technical hacking stuff. Along with with we'll also learn some sed tricks that can be handy on many occasions. Things responsible for Authentication/Permissions with in mongodb replica set- security:   keyFile: "/data/mongo3.2/node3/mongo_3.2-keyfile"   authorization: "enabled" keyFile - This is the path to file that stores the shared secret that all MongoDB instances use to authenticate to each other in a sharded cluster or replica set. authorization - This will Enable or disable Role-Based Access Control (RBAC) to govern each user’s access to database resources and operations. By default, this wil...
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