Category: Linux

AWS S3 Backup Guide 2, aws-cli

If you already have aws-cli installed and want to send a file to Amazon S3 it’s really easy:

aws s3 cp ARCHIVE_TO_SEND s3://BUCKET_NAME/ARCHIVE_TO_SEND
Bash

 

Sending files ‘by hand’ is all good, but if you are serious about backups you need to automate the process, here is a quick and dirty backup script.
It lists, tars, bzips and individually uploads all the directories under the path you specify o the script.
 
You just need to set the variables at lines 5, 6, 7 and 8.
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AWS S3 Backup guide 1, bash script

If you don’t have ( or don’t want ) aws-cli installed you can upload files under 5gb with the following script:

#!/bin/bash
# Size limit of 5gb, if you need to upload a bigger file use AWS Cli tools
# $1 Must be the full path of the file
file=$(basename $1)

# S3 authentication information
bucket="<NameOfTheAwsBucket>"
s3Key=""<AWSAccessUser>"
s3Secret="<AWSAccessKey>"
awspath=s3.amazonaws.com
resource="/${bucket}/${file}"

# as we are uploading a backup the need to be a tar archive
contentType="application/x-compressed-tar"
dateValue=$(date -R)
stringToSign="PUT\n\n${contentType}\n${dateValue}\n${resource}"


# Signature magic :)
signature=$(echo -en ${stringToSign} | openssl sha1 -hmac ${s3Secret} -binary | base64)

curl -X PUT -T "${file}" -H "Host: ${bucket}.s3.amazonaws.com" -H "Date: ${dateValue}" -H "Content-Type: ${contentType}" -H "Authorization: AWS ${s3Key}:${signature}" https://${bucket}.${awspath}/${file}
Bash

 
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Setting Enviroment Variables for PHP-FPM with Apache

Once in a while you may want to be able to pass information from the apache server to the php-fpm process, a way of doing it is by using environment variables, you can set them either in .htaccess files or in your virtual host configuration files.
 
You can set one variable per line as the following in your file of choice:

SetEnv VARIABLE_NAME "VARIABLE_VALUE"
Apache Configuration

 
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Force apt-get to use IPv4

If you are having problems with apt and IPv6 a temporary solution is to use the option ‘Acquire::ForceIPv4=true’ by appending ‘-o Acquire::ForceIPv4=true’ at the end of the apt command.

apt-get update -o Acquire::ForceIPv4=true
Bash

 
If you want a more permanent solution you can disable the usage of IPv6 with apt altogether with:

echo 'Acquire::ForceIPv4 "true";' | tee /etc/apt/apt.conf.d/99force-ipv4
Bash

 

Sources:

https://unix.stackexchange.com/questions/9940/convince-apt-get-not-to-use-ipv6-method

Bad Idea of the day, Disabling VLC root check

Trailing in the deeps of the interwebs, I found an interesting Post, It teaches how to disable the root check for the VLC media player.
 
As some may know VLC rightfully refuses to run as root, and why you would want to run a video player as root is beyond me, but the post explain in some detail how to use a hex editor to search and alter the call to the ‘geteuid()’ function to a call of the ‘getppid()’ function effectively neutering the root check.
 
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Enable KSM Centos7/Debian

If you run a lot of Virtual Machines using qemu, you probably can save a lot of memory, at the expense of CPU cycles, by enabling Kernel Samepage Merging (KSM).
 
If you just want to test it and run only on the current boot run the following:

echo 1 > /sys/kernel/mm/ksm/run
Bash

 
After testing if you want to enable it permanently you can use systemd temporary files.
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Install python2-certbot-dns-route53 centos 7

If you’ve been bitten by the following bug during the installation of the certbot DNS auth plugin for route53.

---> Package python2-boto3.noarch 0:1.4.6-1.el7 will be installed
--> Processing Dependency: python2-s3transfer >= 0.1.10 for package: python2-boto3-1.4.6-1.el7.noarch
Package python2-s3transfer is obsoleted by python-s3transfer, but obsoleting package does not provide for requirements
--> Finished Dependency Resolution
Error: Package: python2-boto3-1.4.6-1.el7.noarch (epel)
           Requires: python2-s3transfer >= 0.1.10
           Available: python2-s3transfer-0.1.10-1.el7.noarch (epel)
               python2-s3transfer = 0.1.10-1.el7
Log

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