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Get environment variable value in Dockerfile
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add -e key for passing environment variables to container.
example:
$ MYSQLHOSTIP=$(sudo docker inspect -format="{{ .NetworkSettings.IPAddress }}" $MYSQL_CONRAINER_ID)
$ sudo docker run -e DBIP=$MYSQLHOSTIP -i -t myimage /bin/bash
root@87f235949a13:/# echo $DBIP
172.17.0.2
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Build tree array from flat array in javascript
...que id,
parentId : the id of the parent node (which is 0 if the node is a root of the tree)
level : the level of depth in the tree
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Can you get DB username, pw, database name in Rails?
...%
require 'parseconfig'
c=ParseConfig.new('../../.my.cnf') %>
mysqlevn: &mysql
adapter: mysql
username: <%= c.params['client']['user'] %>
password: <%= c.params['client']['password'] %>
host: localhost
socket: <%= [
'/var/run/mysqld/mysqld.sock',
'/va...
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...th on an Intel Core Duo, and while looking at various approaches to square root I've noticed something odd: using the SSE scalar operations, it is faster to take a reciprocal square root and multiply it to get the sqrt, than it is to use the native sqrt opcode!
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Implement touch using Python?
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# Current directory which is "walked through"
# | Directories in root
# | | Files in root Working directory
# | | | |
for root, _, filenames in os.walk('.'):
for fname in filenames:
pathname = os.path.join(root, fname)
try:
os.utime(p...
Table is marked as crashed and should be repaired
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Run this from your server's command line:
mysqlcheck --repair --all-databases
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PHP: Convert any string to UTF-8 without knowing the original character set, or at least try
...a pure UTF-8 stack all the way through to your database. I have been using MySQL's utf8mb4 encoding for tables, fields, and connections.
My situation boiled down to "I just want my sanitizers, validators, business logic, and prepared statements to deal with UTF-8 when data comes from HTML forms, or...
How do I adb pull ALL files of a folder present in SD Card
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If you want to pull a folder owned by root, start an adb root session (using $ adb root).
– MasterAM
Jun 12 '14 at 13:32
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What are the applications of binary trees?
...hing when you balance them. This involves rotating sub-trees through their root node so that the height difference between any two sub-trees is less than or equal to 1. Adding those names above one at a time into a balanced tree would give you the following sequence:
1. Alice
/ \
= ...
Python class inherits object
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Calling the root class object isn't all that confusing, and in fact it's pretty standard. Smalltalk has a root class named Object, and a root metaclass named Class. Why? Because, just as Dog is a class for dogs, Object is a class for obj...