Author Archives: Adam Young

About Adam Young

Once upon a time I was an Army Officer, but that was long ago. Now I work as a Software Engineer. I climb rocks, play saxophone, and spend way too much time in front of a computer.

Running git and gitweb in a container with Fedora

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There are many reasons to run a web service in a container. One of the remote services I rely on most heavily is git. While git local operations are fine in a global namespace, running a shared git repository on a remote server is a web-service based use case. There are three protocols used most commonly to remotely access git: git, ssh, and https. I am going to focus on the last one here.

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Running a Container Registry Behind Apache HTTPD

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I had originally run my container registry using a self signed certificate like this:

podman run --name mirror-registry -p 4000:5000     -v /opt/registry/data:/var/lib/registry:z      -v /opt/registry/auth:/auth:z      -e "REGISTRY_AUTH=htpasswd"      -e "REGISTRY_AUTH_HTPASSWD_REALM=Registry Realm"      -e REGISTRY_AUTH_HTPASSWD_PATH=/auth/htpasswd      -v /opt/registry/certs:/certs:z      -e REGISTRY_HTTP_TLS_CERTIFICATE=/certs/domain.crt      -e REGISTRY_HTTP_TLS_KEY=/certs/domain.key      -e REGISTRY_COMPATIBILITY_SCHEMA1_ENABLED=true -d docker.io/library/registry:2

But now that I am using FreeIPA for my Bastion host, I want to use the IPA CA cert for signing the HTTPS request. The easiest thing to do is to run the registry in the container still, but then to front it with mod_proxy.

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Syncing and Serving Yum Repos on RHEL 8

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My Lab machines do not have direct access to the internet. This mirrors how my customers tend to run their environments. Instead, I run a single bastion host that can connect to the internet, and use that to perform all operations on my lab machines.

While it is great to be able to use the Install media to add packlages to PXE booted systems, after some time, the set of packages available is older than you want. For example, I hit a bug that required an update of Network Manager. So, I want to make a local yum repo from my RHEL 8 subscription. RHEL 8 makes this fairly easy.

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Talking to FreeIPA with python-requests

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The code that Rich M gave me a while back has bit rotted. At some point, I need to get an updated version, but until then, I can continue to talk to the FreeIPA server using Python and the Requests library. In the future, I can get a session cookie, but for now, python3-request-gssapi will work to authenticate me, provided I have a valid TGT.

I pulled the requests-gssapi library from Koji, as it does not currently ship in any of the RHEL8 repos. Here is the one I installed.

https://koji.fedoraproject.org/koji/buildinfo?buildID=1371255

Note that this quick-and-dirty code runs on the IPA server itself. A better approach would be to read the Server name out of /etc/ipa/default.conf. 

#!/bin/python3
import requests
from requests_gssapi import HTTPSPNEGOAuth
import socket
hostname = socket.gethostname()
url = "https://%s/ipa/json" % hostname
referer =  "https://%s/ipa" % hostname
body = {"method":"user_find","params":[[""],{}],"id":0}
 
r = requests.post(url,
                  json = body,
                  auth=HTTPSPNEGOAuth(),
                  headers = {
                    'Content-Type': 'application/json',
                    'Accept': 'applicaton/json',
                    'referer': referer})
print(r.status_code)
if r.status_code  == 200:
    print(r.text)