202101¶

フルカラーLEDの3mmとかで1灯式オーディオレベルメータとして動作できないか¶

cloud-init Documentation — cloud-init 20.4 documentation ¶

k8s installation¶

coding style¶

https://editorconfig.org/
https://github.com/adrienverge/yamllint
https://github.com/rubocop-hq/rubocop
https://eslint.org/

Locust - A modern load testing framework ¶

GitHub - opensaasstudio/plasma: universal server push middleware by using gRPC stream and Server Sent Events(SSE)¶

ffmpegでmp4からgifを生成¶

ffmpeg -i FAST-hue-demo.mp4 -vf scale=800:-1 -r 10 -b:v 5.0M FAST-hue-demo.gif

##None

railsのhttp status symbols¶

:continue
:switching_protocols
:processing
:early_hints
:ok
:created
:accepted
:non_authoritative_information
:no_content
:reset_content
:partial_content
:multi_status
:already_reported
:im_used
:multiple_choices
:moved_permanently
:found
:see_other
:not_modified
:use_proxy
:unused
:temporary_redirect
:permanent_redirect
:bad_request
:unauthorized
:payment_required
:forbidden
:not_found
:method_not_allowed
:not_acceptable
:proxy_authentication_required
:request_timeout
:conflict
:gone
:length_required
:precondition_failed
:payload_too_large
:uri_too_long
:unsupported_media_type
:range_not_satisfiable
:expectation_failed
:misdirected_request
:unprocessable_entity
:locked
:failed_dependency
:too_early
:upgrade_required
:precondition_required
:too_many_requests
:request_header_fields_too_large
:unavailablefor_legal_reasons
:internal_server_error
:not_implemented
:bad_gateway
:service_unavailable
:gateway_timeout
:http_version_not_supported
:variant_also_negotiates
:insufficient_storage
:loop_detected
:bandwidth_limit_exceeded
:not_extended
:network_authentication_required

helpers

def invalid?;             status < 100 || status >= 600;        end
def informational?;       status >= 100 && status < 200;        end
def successful?;          status >= 200 && status < 300;        end
def redirection?;         status >= 300 && status < 400;        end
def client_error?;        status >= 400 && status < 500;        end
def server_error?;        status >= 500 && status < 600;        end
def ok?;                  status == 200;                        end
def created?;             status == 201;                        end
def accepted?;            status == 202;                        end
def no_content?;          status == 204;                        end
def moved_permanently?;   status == 301;                        end
def bad_request?;         status == 400;                        end
def unauthorized?;        status == 401;                        end
def forbidden?;           status == 403;                        end
def not_found?;           status == 404;                        end
def method_not_allowed?;  status == 405;                        end
def precondition_failed?; status == 412;                        end
def unprocessable?;       status == 422;                        end
def redirect?;            [301, 302, 303, 307, 308].include? status; end

ref: 【Rails】APIモードで使えるHTTPステータスコードのシンボルまとめ - Qiita

Ubuntuで起動時に veth pair, bridge, netns を作成し接続する方法 - Qiita ¶

Network Namespaceを使ってLinuxのルーティングテーブルを分離させる - Qiita ¶

systemdの.serviceファイルの書き方 - Qiita ¶

ip netnsコマンドの使い方（ネットワークの実験の幅が広がるなぁ～） - Qiita ¶

perl helloworld¶

helloworld.pl

use re 'eval';
''=~('(?{'.('[[).[|`%,,/`[/[@$'^'+)@@/^(@@@@@,@),@').'!
"})')