Laszlo Miklosik laszlomiklosik

## Docker behind a company HTTP proxy.md

      
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              August 29, 2015 14:18
            
              
                Docker behind a company HTTP proxy
              
          
    In order to be able to download images from the internet,


add the below lines:
export http_proxy=http://proxy:8080
export https_proxy=http://proxy:8080
export no_proxy=*.lan


## Start Python web server to serve current directory
python -m SimpleHTTPServer

## Apache2 Basic Authentication config example
# Add the below in the VirtualHost section (in apache2.conf of the sites-enabled/* file):

        <Location />
            Deny from all
            AuthUserFile /usr/local/etc/httpd/users
            AuthName authorization
            AuthType Basic
            Satisfy Any
            require valid-user
        </Location>

## Cropping the relevant section from a log file
# 1) get line number of first relevant log line: (e.g. by date 2014-01-13 13:49)
grep "2014-01-13 13:49" original.log -n | more

# 2) get line number of last relevant log line: (e.g. by date 2014-01-13 16:36)
grep "2014-01-13 16:36" original.log -n | more

# 3) the total number of lines from the original log file:
wc -l original.log -n

# e.g. results of 1-3:

## Mark all *.sh files executable in all subdirectories
find . -iname \*.sh | xargs chmod +x

## Search file by contained text (Linux command)
 # find all XML files from current directory (including its subdirectories recursively) by content 'sonar'
 find . -name '*.xml' -print0 | xargs -0 grep 'sonar'

## Linux see how long a process has been running - uptime
# Example command for checking how long a Java process was running (etime = elapsed time)
ps -eo pid,comm,cmd,start,etime | grep java

# It will return something like:
# 21443 java            /opt/jdk8/bin/java -Djava.u   Feb 25  3-12:46:12
# and this means an uptime of 3 Days, 12 Hours, 46 Minutes and 12 Seconds

# More alternatives & explanations here: http://linuxcommando.blogspot.ro/2008/09/how-to-get-process-start-date-and-time.html

## Push a new changeset to Gerrit
# 1. First make sure you copied the Gerrit commit-msg hook (from Gerrit to your local repos .git/hooks folder)

# 2. Make the code changes needed and then stage them using the usual command
git add . -A

# 3. Now commit them using amend and notice that the previous commit message is used but is suffixed with the Change-Id of your previous commit. Make sure you leave that (even if you modify the commit message). Note: modifying the commit message will overwrite the previous one.
git commit --amend

# 4. push your changes for review:
git push origin HEAD:refs/for/master

## Linux monitor the number of connections on a given port
# below example is a shell script which logs the number of connections every 30 seconds


#!/bin/bash
if [ "$#" -ne 1 ]; then
        echo "Please provide the port number for which you want to monitor the connection count as the one and only argument!"
        exit
fi
while true; do
    crtDate=`date`

## Create heap dump on the fly using jmap
# jmap is in $JAVA_HOME/bin/ (assumed in your path, but you can use the complete path if it's not)
jmap -dump:format=b,file=heap_dump.hprof <process ID>
	# Add the below in the VirtualHost section (in apache2.conf of the sites-enabled/* file):

	<Location />
	Deny from all
	AuthUserFile /usr/local/etc/httpd/users
	AuthName authorization
	AuthType Basic
	Satisfy Any
	require valid-user
	</Location>
	# 1) get line number of first relevant log line: (e.g. by date 2014-01-13 13:49)
	grep "2014-01-13 13:49" original.log -n \| more

	# 2) get line number of last relevant log line: (e.g. by date 2014-01-13 16:36)
	grep "2014-01-13 16:36" original.log -n \| more

	# 3) the total number of lines from the original log file:
	wc -l original.log -n

	# e.g. results of 1-3:
	# find all XML files from current directory (including its subdirectories recursively) by content 'sonar'
	find . -name '*.xml' -print0 \| xargs -0 grep 'sonar'
	# Example command for checking how long a Java process was running (etime = elapsed time)
	ps -eo pid,comm,cmd,start,etime \| grep java

	# It will return something like:
	# 21443 java /opt/jdk8/bin/java -Djava.u Feb 25 3-12:46:12
	# and this means an uptime of 3 Days, 12 Hours, 46 Minutes and 12 Seconds

	# More alternatives & explanations here: http://linuxcommando.blogspot.ro/2008/09/how-to-get-process-start-date-and-time.html
	# 1. First make sure you copied the Gerrit commit-msg hook (from Gerrit to your local repos .git/hooks folder)

	# 2. Make the code changes needed and then stage them using the usual command
	git add . -A

	# 3. Now commit them using amend and notice that the previous commit message is used but is suffixed with the Change-Id of your previous commit. Make sure you leave that (even if you modify the commit message). Note: modifying the commit message will overwrite the previous one.
	git commit --amend

	# 4. push your changes for review:
	git push origin HEAD:refs/for/master
	# below example is a shell script which logs the number of connections every 30 seconds


	#!/bin/bash
	if [ "$#" -ne 1 ]; then
	echo "Please provide the port number for which you want to monitor the connection count as the one and only argument!"
	exit
	fi
	while true; do
	crtDate=`date`
	# jmap is in $JAVA_HOME/bin/ (assumed in your path, but you can use the complete path if it's not)
	jmap -dump:format=b,file=heap_dump.hprof <process ID>