Debian non-free firmware netinst ISOs

The latest images are always found at the link, it’s name should be something like “firmware-?.?.?-amd64-netinst.iso”:

http://cdimage.debian.org/cdimage/unofficial/non-free/cd-including-firmware/current/amd64/iso-cd/

In case you happen to need an older version of the boot image, you can search for the specific version that you need on this link:

http://cdimage.debian.org/cdimage/unofficial/non-free/cd-including-firmware/archive/

Install php7.2 Debian Stretch

As PHP versions 5.6 and 7.0 reach End Of Life you might want to update to something newer and supported, unfortunately the official Debian Stretch repositories don’t have PHP versions 7.1 or 7.2 yet, but with a third-party repository and a bit of fiddling it’s easy to update, and more importantly keep it updated, your server PHP version.
 

Just run as root:
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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

 

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}

 
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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

 
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

 

Sources:

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

Disable IPv6 Centos/Debian/Ubuntu

To completely disable IPv6 on your Linux system, side note you shouldn’t but it’s your choice, you can do so simply editing the 99-sysctl.conf file at the location ‘/etc/sysctl.d/99-sysctl.conf’
 
Copy and paste the following 3 lines at the bottom of the file.

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

 
After editing the file you need to then reboot the machine or run the following command as root

sysctl -p

To verify that you have ipv6 disabled you can run

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