Should I use Docker bridge mode or host networking for this application?
I'm running an application in a Docker container that is exposed to Internet users and machines through HTTPS on port 443. The application also needs outbound access to…
DNS resolution
Why does my Docker Swarm PostgreSQL cluster keep falling apart?
I'm trying to run a basic highly available PostgreSQL cluster with Spilo-based images in Docker Swarm. Every few days, it starts failing in several ways: DNS resolution problems,…
Why does my Spilo PostgreSQL cluster keep falling apart in Docker Swarm?
I'm trying to run a basic highly available PostgreSQL cluster with Spilo images on a Docker Swarm setup, but every few days it starts failing in multiple ways:…
Why does my internal .local domain return SERVFAIL through the system resolver?
On ansiblesrv01, querying srv01.sym.local through the local resolver at 127.0.0.53 returns SERVFAIL, but querying the authoritative DNS server at 10.16.1.1 directly returns 192.168.0.225. The environment inherited the .local…
Is Proofpoint having a DNS-related outage affecting email delivery?
Is anyone else unable to send or receive external email through Proofpoint? Our inbound and outbound mail stopped working at the same time, and the Proofpoint MX records…
Why Isn't CoreDNS Refreshing Automatically in My K3s Setup?
Hey everyone! I'm diving into K3s for my homelab, and I've hit a bit of a snag. Here's what my setup looks like: I have three nodes: `debian`…
Help with Creating a Private AKS Cluster Due to DNS Issues
Hey everyone, I'm having trouble building a private Azure Kubernetes Service (AKS) cluster because of outbound DNS resolution problems. I've set up a User Defined Route (UDR) from…
Setting Up DNS Architecture in a Hybrid Hub and Spoke Azure Environment
I'm working with a hybrid hub and spoke architecture in Azure, connected to on-premises via ExpressRoute. We have Azure Firewall (AZFW) in the hub with DNS proxy enabled.…
How to Get App Gateway to Resolve Key Vault Private Endpoint?
Hey all, I'm running into a problem while deploying the App Gateway Standard SKU v2. The App Gateway is set up in a spoke VNet, and I've linked…
Why can't AT&T users access my website anymore?
I'm running a small business website that suddenly became inaccessible for anyone using an AT&T cellular network. Personally, on my AT&T phone, it seems like the connection just…