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Zipkin is a distributed tracing system. It helps gather timing data needed to troubleshoot latency problems in microservice architectures. The front end is a “waterfall” style graph of service calls showing call durations as horizontal bars:

Metrics

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Zipkin is a distributed tracing system. It helps gather timing data needed to troubleshoot latency problems in microservice architectures. It manages both the collection and lookup of this data through a Collector and a Query service. Zipkin’s design is based on the Google Dapper paper.

Collecting traces helps developers gain deeper knowledge about how certain requests perform in a distributed system. Let’s say we’re having problems with user requests timing out. We can look up traced requests that timed out and display it in the web UI. We’ll be able to quickly find the service responsible for adding the unexpected response time. If the service has been annotated adequately we can also find out where in that service the issue is happening.

web-screenshot

 

more: https://blog.twitter.com/2012/distributed-systems-tracing-with-zipkin

githup: https://github.com/openzipkin/zipkin
gitter: https://gitter.im/openzipkin/zipkin/

500 Internal Server Error while uploading files

Apache, CodeIgniter, Linux, nginx

I was having a 500 Internal Server Error…
nginx logs were showing me the following

2016/03/17 12:09:32 [crit] 31488#0: *11192 open() "/var/lib/nginx/tmp/client_body/0000000005" failed (13: Permission denied), client: 84.91.XXX.XXX, server: host.com, request: "POST /trades_edit/edit_trade HTTP/1.1", host: "host.com", referrer: "https://host.com/trades_edit/125"

Solution?

chown -R www-data:www-data /var/lib/nginx

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What is Rancher?

Rancher is open source software that makes it simple for organizations to deploy a private container service and deliver Docker orchestration to users. Within a team, authorized users are able to create resource pools from any hosts, and then launch containers or application templates from Rancher’s UI or CLI. Users have complete control over how their applications are deployed, and Rancher provides all of the necessary infrastructure services such as networking, load balancing, and storage to ensure the application runs brilliantly on any infrastructure.

service_upgrade

Continue reading rancher.com →