If you want to perform a failover on another haproxy backend server this is the way you should do it:

Gather information

Via hatop

Note: Please mind that the names of frontends / backends / servers are only examples. Mind this when yo...

To delete a specific redis-DB you need to use the FLUSHDB-command in combination with the SELECT-command. For more information have a look at the documentation for FLUSHDB and [SELECT](https://redis.io/com...

If you have a single node elasticsearch instance and indices with replicas enabled your cluster state will be yellow. If you have replica shards they should be moved to a different node for high availability purposes. With a single node this can't...

Create a 1 GB file to swap to (we have sufficient space on / on this machine. Use a different partition if necessary)

sudo dd if=/dev/zero of=/var/swapfile bs=1M count=1024

If you prefer 2GB swap, chose count=2048, 4GB: count=4096

C...

I'm creating certificate requests with this command:

openssl req -new -out www.example.com.csr -keyout www.example.com.key -newkey rsa:2048 -nodes

When I try to upload the certificate to AWS IAM I get this error:

$ aws iam upload-se...

1. Install and configure the AWS Command Line Interface

2. Show existing certificates to test if the AWS Cli is working:

   $ aws iam list-server-certificates
   {
     "ServerCertificateMetadataList": [...
   

example

We want to make the following firewall rule to be applyable to different network interfaces (for e.g. different environments) with just one variable:

firewall { "010-reject-port":
  ensure      => present,
  dport       => [ 80...