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Published Tutorial
Sockets are a way to enable inter-process communication between programs running on a server, or between programs running on separate servers. Communication between servers relies on network sockets, which use the Int...
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By
Jamon Camisso
Networking
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Published Tutorial
Velero is a convenient backup tool for Kubernetes clusters that compresses and backs up Kubernetes objects to object storage. It also takes snapshots of your cluster’s Persistent Volumes using your cloud provider’s bl...
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By
Hanif Jetha, Jamon Camisso
Backups
Kubernetes
Solutions
Object Storage
DigitalOcean
Block Storage
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Published Tutorial
Security Enhanced Linux (SELinux) is an access control system that is built into the Linux kernel. It is used to enforce policies that define which resources users, programs and services can use on a system. In its de...
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By
Jamon Camisso
Glossary
Security
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Published Tutorial
Many Linux distributions use systemd to manage system settings and services. systemd organizes tasks into components called units, and groups of units into targets, that can be used to create dependencies on other sys...
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By
Jamon Camisso
System Tools
Glossary
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When building modern, stateless applications, containerizing your application’s components is the first step in deploying and scaling on…
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By
Kathleen Juell, Jamon Camisso
Kubernetes
Ruby on Rails
Docker
PostgreSQL
Redis
Development
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Published Answer
DigitalOcean Load Balancers will set some HTTP headers that pass the source IP through to your backend servers, like CloudFlare doe…
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By
jamonation
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Published Answer
If you are using a managed database then the default port and host differ from the usual port 5432.
You can test the connection …
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By
jamonation
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Published Answer
What does your vars file look like? If you’re following the Ubuntu 20.04 tutorial then it should only have these two lines:
“…
Accepted Answer:
What does your vars file look like? If you’re following the Ubuntu 20.04 tutorial then it should only have these two lines:
“…
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By
jamonation
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You may encounter an HAProxy Setting tune.ssl.default-dh-param to 1024 by default warning message if your HAProxy server is configured with an SSL/TLS certificate and key, but there isn’t a value set for the tune.ssl....
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By
Jamon Camisso
HAProxy
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Published Answer
The easiest way to get traffic flowing would be to configure the system at 10.0.0.4 to also have a VPN connection.
Otherwise, yo…
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By
jamonation
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Published Answer
So, following up on previous comments and reading the Strongswan docs on [Responder Configuration](https://wiki.strongswan.org/proj…
Accepted Answer:
So, following up on previous comments and reading the Strongswan docs on [Responder Configuration](https://wiki.strongswan.org/proj…
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By
jamonation
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An HAProxy cannot bind socket error message is generated when there is another process listening on the same interface and TCP port combination that HAProxy is configured to use, or when HAProxy attempts to use an IP ...
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By
Jamon Camisso
HAProxy
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There are three main commands, and a common log location that you can use to get started troubleshooting HAProxy errors. Generally when you are troubleshooting HAProxy, you will use these commands in the order indicat...
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By
Jamon Camisso
HAProxy
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By default on many CentOS 8 installations, HAProxy is not configured to write its log output to a file. This quickstart tutorial will explain how to configure HAProxy logging with Rsyslog and SELinux rules by using a ...
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By
Jamon Camisso
Logging
HAProxy
CentOS
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Published Tutorial
A virtual private network, or VPN, allows you to securely encrypt traffic as it travels through untrusted networks, such as those at the coffee shop, a conference, or an airport.
In this tutorial, you'll set up an IKE...
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By
Jamon Camisso
VPN
Security
Ubuntu
Ubuntu 20.04
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Published Tutorial
Neo4j is a graph database that records relationships between data nodes, whereas traditional relational databases use rows and columns to store and structure data. Since each node stores references to all the other no...
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By
Jamon Camisso
Databases
NoSQL
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Published Answer
This question was answered by @erikschindeldecker:
That was it - I was missing the : and space before RSA in the ipsec.secrets …
Accepted Answer:
This question was answered by @erikschindeldecker:
That was it - I was missing the : and space before RSA in the ipsec.secrets …
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By
jamonation
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Published Tutorial series
This tutorial series explains how to troubleshoot and fix some of the most common errors that you may encounter when using the HAProxy (https://www.digitalocean.com/community/tags/haproxy) TCP and HTTP proxy server.
E...
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By
Jamon Camisso
HAProxy
Logging
CentOS
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An Apache AH00558: Could not reliably determine the server's fully qualified domain name message is generated when Apache is not configured with a global ServerName directive. The message is mainly for informational p...
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By
Jamon Camisso
Apache
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An Apache AH02572: Failed to configure at least one certificate and key error message is generated when Apache is configured to use the ssl module, but is missing a TLS/SSL public certificate and corresponding private...
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By
Jamon Camisso
Apache