Chris Moos's Blog - Latest Comments

Re: DN42 Peering | chrismoos.com

chrismoos — Mon, 25 May 2020 01:47:54 -0000

Hey @Merlin Bussard ,

Send me an e-mail and I'll help you get an IPv6 only one setup.

Chris

Re: DN42 Peering | chrismoos.com

Merlin Bussard — Sat, 23 May 2020 04:02:29 -0000

I cannot create a IPv6 only peering with your wizard via ssh :-(

Re: Zero Downtime Deployments in Kuberentes – Chris Moos – software engineer, hacker, AS203560 network operator

Abhishek Singh — Thu, 27 Dec 2018 02:45:02 -0000

nice article!!!

Re: MySQL and partitioning tables with millions of rows – Chris Moos – software engineer, hacker, AS203560 network operator

Shubham Goyal — Wed, 12 Sep 2018 10:21:30 -0000

are you adding partitions manually every time device_id is crossing last partition limit?
or do you have any solution to alter the table partitions dynamically

Re: Zero Downtime Deployments in Kuberentes – Chris Moos – software engineer, hacker, AS203560 network operator

Atheist Dick — Thu, 21 Jun 2018 05:44:52 -0000

Hi have you been able to fix the missing image issue?

Re: Groovy scripts and JVM Security

Mike Rodent — Thu, 14 Jun 2018 03:12:25 -0000

Wow... 8 years later! I wonder if you're still interested in this?

I've got here because of this question on SO: https://stackoverflow.com/q... - so clearly I'm bothered about information-hiding and encapsulation rather than untrusted scripts

When I went $ groovy trusted.groovy I got:

mike@M17A ~/test $ groovy trusted.groovy
Checking to see if security manager is enabled...
Security manager not enabled, using default.
Caught: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "createClassLoader")
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImp...:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:116)
at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:138)
Caused by: java.lang.ExceptionInInitializerError
at groovy.ui.GroovyMain.run(GroovyMain.java:342)
at groovy.ui.GroovyMain.process(GroovyMain.java:315)
at groovy.ui.GroovyMain.processArgs(GroovyMain.java:134)
at groovy.ui.GroovyMain.main(GroovyMain.java:114)
... 6 more
Caused by: java.security.AccessControlException: access denied ("java.util.logging.LoggingPermission" "control")
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:472)
at java.security.AccessController.checkPermission(AccessController.java:884)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
at java.util.logging.LogManager.checkPermission(LogManager.java:1586)
at java.util.logging.Logger.checkPermission(Logger.java:422)
at java.util.logging.Logger.setUseParentHandlers(Logger.java:1799)
at org.codehaus.groovy.runtime.StackTraceUtils.<clinit>(StackTraceUtils.java:56)
... 10 more

Re: Zero Downtime Deployments in Kuberentes – Chris Moos – software engineer, hacker, AS203560 network operator

chrismoos — Thu, 07 Jun 2018 18:09:37 -0000

Thanks @yebyen, will take a look and fix that!

Re: Zero Downtime Deployments in Kuberentes – Chris Moos – software engineer, hacker, AS203560 network operator

yebyen — Thu, 07 Jun 2018 16:16:06 -0000

In a deployment, is a spec for the pod or "pod template" – this is where readiness and liveness probes can be defined for deployments.

Re: Zero Downtime Deployments in Kuberentes – Chris Moos – software engineer, hacker, AS203560 network operator

yebyen — Thu, 07 Jun 2018 11:38:21 -0000

Hello! This is a great article but you have a broken image reference in it! https://www.chrismoos.com/i...

Also, you are #5 on the front page of Google if searching for "kubernetes rolling update deployment health checks." Cheers! (even in spite of the fact that you've spelled it wrong as "Kuberentes" – LOL, and three times!)

Re: MySQL and partitioning tables with millions of rows – Chris Moos – software engineer, hacker, AS203560 network operator

Mahen Nakar — Fri, 04 May 2018 05:04:16 -0000

did you check explain query with between clause for device_id.. I guess it will use all partitions as you are using partition by hash

Re: avr-os: Multitasking on Arduino – Chris Moos – software engineer, hacker, AS203560 network operator

Irwan ayeah — Mon, 12 Mar 2018 18:20:48 -0000

amazing.. thx bro..

Re: MySQL and partitioning tables with millions of rows – Chris Moos – software engineer, hacker, AS203560 network operator

gibranda — Fri, 15 Dec 2017 02:17:24 -0000

thanks for sharing

Re: MySQL and partitioning tables with millions of rows – Chris Moos – software engineer, hacker, AS203560 network operator

BANDER ALNASSER — Wed, 18 Oct 2017 02:56:34 -0000

hi man , thanks alot for this , if i user the partition column inside function like
select * from A1 where COALESCE(partition_column, 1) =1
will that call the partition , or i should show the partition column explicitly
like
" select * from A1 where (partition_column=1 or partition_column is null)

Re: Death to JSON!

HaloMaster — Mon, 18 Sep 2017 00:40:08 -0000

标题党 Titler

Re: Zero Downtime Deployments in Kuberentes – Chris Moos – software engineer, hacker, AS203560 network operator

Lukáš Doležal — Fri, 15 Sep 2017 07:52:15 -0000

Hi. I'm just wondering, is the readiness probe necessary for stopping kube to route the requests? According to this https://kubernetes.io/docs/... it says:

> 3. Kubernetes marks the Pod state as “Terminating” and stops sending traffic to the Pod.

Have you experienced that this is not actually the implemented behaviour?

Re: Zero Downtime Deployments in Kuberentes – Chris Moos – software engineer, hacker, AS203560 network operator

Amith Kashyap — Wed, 13 Sep 2017 04:42:00 -0000

readinessProbes are available in pod definitions. But if one is using "Deployments", how can one implement preventing new requests and draining of the existing resources ?
We are seeing few requests getting 404 during update, so its not looking like its being taken care automatically, hence the question.

Re: Zero Downtime Deployments in Kuberentes – Chris Moos – software engineer, hacker, AS203560 network operator

Ahmet Alp Balkan — Sat, 15 Jul 2017 13:30:49 -0000

Completely my bad, it looks like I have not read the docs correctly. Thanks for taking time to correct!

Re: Zero Downtime Deployments in Kuberentes – Chris Moos – software engineer, hacker, AS203560 network operator

chrismoos — Fri, 14 Jul 2017 18:52:49 -0000

Hi Ahmet,

The liveness and readiness probes are orthogonal -- liveness is used to determine if a container should be restarted, whereas a readiness probe is used to determine if a container should receive traffic (via ingress controller, LB, etc,.). Both readiness and liveness are probed continually when a pod is running, not just during startup.

In the above rolling update example, the readinessProbe is taken advantage of to willfully stop receiving requests and allowing existing connections to drain, prior to the container being killed.

Re: Zero Downtime Deployments in Kuberentes – Chris Moos – software engineer, hacker, AS203560 network operator

Ahmet Alp Balkan — Fri, 14 Jul 2017 18:12:53 -0000

I think you meant to use livenessProbes instead of readinessProbes. When you're doing a rolling "update", it probably means you already have something running already. readinessProbes are used only the first time a pod starts to find out the traffic should be routed to that container. Once a readinessProbe succeeds, livenessProbe is used to determine health of the pod.

Re: MySQL and partitioning tables with millions of rows

Samuel Pillai — Tue, 06 Jun 2017 12:49:05 -0000

yes ,u have to

Re: MySQL and partitioning tables with millions of rows

chrismoos — Mon, 22 May 2017 17:20:17 -0000

My memory is a bit fuzzy as this was a long time ago, but yes, ideally a combination of partitioning + indexes will give the best performance.

Re: MySQL and partitioning tables with millions of rows

Adarsh Mysore Thimmappa — Tue, 16 May 2017 07:36:07 -0000

Well explained article. Thank you.

Re: avr-os: Multitasking on Arduino – Chris Moos – software engineer, hacker, AS203560 network operator

Olufemi — Tue, 11 Apr 2017 06:01:42 -0000

Welldone great job. i applied it and it is working.

Re: MySQL and partitioning tables with millions of rows

Jeff Kuchta — Tue, 28 Mar 2017 16:08:51 -0000

Did you try any indexes?

Re: libactor - a C library based on the Actor model

IlianZapryanov — Fri, 27 Jan 2017 06:23:26 -0000

Awesome! This something really good to see, and no setjmp/longjmp, simply put - great!