Debugging the Alpine boot process

By Maximilian Batz | 2019-01-22

As discussed in my previous post, Alpine Linux goes through several stages when it boots. Just after mounting the boot media, and scanning it for apkovl’s (with nlplug-findfs), there is an option for you to get a console, by setting $SINGLEMODE to yes. Setting SINGLEMODE to yes is easy, you simply add the word “single”…

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kemal-session does not persist data

By Maximilian Batz | 2019-01-22

https://github.com/kemalcr/kemal-session Analyse what is happening with your session cookie. In my case, the session cookie was reset everytime I went to login. I realized, that my idea of cleaning up the old session as a first statement after successful login, before setting up the new session is not a good idea. I suspect, that the…

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Using modules in crystal

By Maximilian Batz | 2019-01-22

As your application grows, you would like to move from one big .cr file to separating your code into smaller files. You can use require from your main .cr file to add code from other files: require “./tools/*” This statement will add code from the tools directory, relative to your main .cr file. This will…

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Route & Redirect with envoy

By Maximilian Batz | 2019-01-17

An example envoy.yaml showing how to route & redirect. There are different options, see here https://www.envoyproxy.io/docs/envoy/latest/api-v2/api/v2/route/route.proto#route-redirectaction This envoy.yaml routes /taxgod and /taxgod/ (the second could probably be omitted because the first one should also match it, I think) to a new port and a different protocol. /picockpit is simply redirected to / and then finally…

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Envoy routing and rewriting snippet

By Maximilian Batz | 2019-01-17

It is possible to rewrite URLs with Envoy for the backend. Please note that the HTML output needs to have the proper routes! (That is why I am not going to investigate further in this direction). REF: https://www.envoyproxy.io/docs/envoy/latest/api-v2/api/v2/route/route.proto#route-route  Also note that the string is going to be rendered literally for direct_response –> body –> inline_string,…

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envoy force SSL example envoy.yaml

By Maximilian Batz | 2019-01-17

static_resources:   listeners:   – address:       socket_address:         address: 0.0.0.0         port_value: 80     filter_chains:     – filters:       – name: envoy.http_connection_manager         config:           codec_type: auto           stat_prefix: ingress_http           route_config:             virtual_hosts:             – name: backend               domains: [“*”]               routes:               – match: { prefix: “/” }                 redirect:                   path_redirect: “/”                   https_redirect: true           http_filters:           – name: envoy.router             config: {}   – address:       socket_address:         address: 0.0.0.0         port_value: 443     filter_chains:     – tls_context:        …

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