-
Find the Discord channel in which you would like to send commits and other updates
-
In the settings for that channel, find the Webhooks option and create a new webhook. Note: Do NOT give this URL out to the public. Anyone or service can post messages to this channel, without even needing to be in the server. Keep it safe!
On Tue Oct 27, 2015, history.state.gov began buckling under load, intermittently issuing 500 errors. Nginx's error log was sprinkled with the following errors:
2015/10/27 21:48:36 [crit] 2475#0: accept4() failed (24: Too many open files)
2015/10/27 21:48:36 [alert] 2475#0: *7163915 socket() failed (24: Too many open files) while connecting to upstream...
An article at http://www.cyberciti.biz/faq/linux-unix-nginx-too-many-open-files/ provided directions that mostly worked. Below are the steps we followed. The steps that diverged from the article's directions are marked with an *.
- * Instead of using
su
to runulimit
on the nginx account, useps aux | grep nginx
to locate nginx's process IDs. Then query each process's file handle limits usingcat /proc/pid/limits
(wherepid
is the process id retrieved fromps
). (Note:sudo
may be necessary on your system for thecat
command here, depending on your system.) - Added
fs.file-max = 70000
to /etc/sysctl.conf
/* | |
* Random-Number Utilities (randutil) | |
* Addresses common issues with C++11 random number generation. | |
* Makes good seeding easier, and makes using RNGs easy while retaining | |
* all the power. | |
* | |
* The MIT License (MIT) | |
* | |
* Copyright (c) 2015-2022 Melissa E. O'Neill | |
* |
To remove a submodule you need to:
- Delete the relevant section from the .gitmodules file.
- Stage the .gitmodules changes git add .gitmodules
- Delete the relevant section from .git/config.
- Run git rm --cached path_to_submodule (no trailing slash).
- Run rm -rf .git/modules/path_to_submodule (no trailing slash).
- Commit git commit -m "Removed submodule "
- Delete the now untracked submodule files rm -rf path_to_submodule
# replace file basename with a UUID when uploaded | |
# e.g.: avatar.jpg becomes 41bf830f-80cf-4efe-ad90-3b29bc6708b5.jpg | |
# but don't regenerate a UUID each time file url is accessed | |
class User < ActiveRecord::Base | |
has_attached_file :avatar, path: ":basename.:extension" | |
before_validation { set_avatar_file_name } | |
def set_avatar_file_name | |
# replace any NEW filename with a UUID |
(by @andrestaltz)
If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.
======= Prolbem ================================================================================================================= | |
I have installed : ruby-2.0.0,postgres-9.2 , now in rails app when I execute: | |
rake db:create , command I get: | |
PG::InvalidParameterValue: ERROR: new encoding (UTF8) is incompatible with the encoding of the template database (SQL_ASCII) | |
HINT: Use the same encoding as in the template database, or use template0 as template. | |
: CREATE DATABASE "my_db_name" ENCODING = 'unicode'....... | |
bin/rake:16:in `load' |
// = Requirements: freetype 2.5, libpng, libicu, libz, libzip2 | |
// = How to compile: | |
// % export CXXFLAGS=`pkg-config --cflags freetype2 libpng` | |
// % export LDFLAGS=`pkg-config --libs freetype2 libpng` | |
// % clang++ -o clfontpng -static $(CXXFLAGS) clfontpng.cc $(LDFLAGS) \ | |
// -licuuc -lz -lbz2 | |
#include <cassert> | |
#include <cctype> | |
#include <iostream> | |
#include <memory> |
=Navigating= | |
visit('/projects') | |
visit(post_comments_path(post)) | |
=Clicking links and buttons= | |
click_link('id-of-link') | |
click_link('Link Text') | |
click_button('Save') | |
click('Link Text') # Click either a link or a button | |
click('Button Value') |
#! /bin/bash | |
### BEGIN INIT INFO | |
# Provides: redis-server | |
# Required-Start: $remote_fs $syslog | |
# Required-Stop: $remote_fs $syslog | |
# Should-Start: $local_fs | |
# Should-Stop: $local_fs | |
# Default-Start: 2 3 4 5 | |
# Default-Stop: 0 1 6 | |
# Short-Description: redis-server - Persistent key-value db |