Curl on Support Tools

Managing Nagios Downtime via Command Line Using cURL

Thu, 20 Feb 2025 09:00:00 -0600

Discover how to programmatically manage Nagios downtimes using cURL, enabling automated maintenance windows and reducing alert noise during planned system work.

cURL Host Header: Set It With -H, --resolve or --connect-to

Mon, 25 Nov 2024 23:00:00 -0500

Setting the HTTP Host header with cURL is how you test a virtual host, a load balancer or a new server before you change DNS. This guide gives the exact commands for HTTP and HTTPS, explains why -H 'Host: ...' alone fails on HTTPS, and ends with a small hcurl shell helper so you never have to look the syntax up again.

Add a CA Certificate to Ubuntu: update-ca-certificates

Thu, 12 Oct 2023 23:18:00 -0500

To trust a private or self-signed certificate authority on Ubuntu, put the CA certificate in /usr/local/share/ca-certificates/ with a .crt extension and run sudo update-ca-certificates. That rebuilds /etc/ssl/certs/ca-certificates.crt, the bundle that curl, wget, git, apt, OpenSSL and most other tools on Ubuntu read. The procedure is identical on Ubuntu 22.04, 24.04 and 26.04. This guide covers getting the right certificate, the expected output, the three mistakes that make it silently do nothing, and the applications that ignore the system store.