Running FreeIPA on Ubuntu Using Podman – Part 2: Step-by-Step Deployment

This is the full guide step by step implementation to launch, prepare and configure the FreeIPA server inside a Podman container.

Accessing the FreeIPA administrative web interface securely via HTTPS.

Step 1: Allow Web Ports
FreeIPA uses normal web ports such as 80 and 443. Sometimes, Linux does not allow normal container processes to use these ports directly, so allow the system to use ports starting from 80.

sudo sysctl -w net.ipv4.ip_unprivileged_port_start=80

Step 2: Start the Container
FreeIPA needs some system services like LDAP and Kerberos, which systemd manages, so we start the container with systemd enabled.
So when we start the container, we must enable systemd inside it.

podman run -d --name freeipa-server \
  --systemd=always \
  --restart always \
  --cap-add=SYS_ADMIN \
  -p 443:443 -p 80:80 -p 389:389 -p 636:636 \
  -p 88:88 -p 464:464 -p 88:88/udp -p 464:464/udp \
  -h ipa.example.edu\
  almalinux:9 /usr/sbin/init

In here,

--systemd=always allows systemd to run inside the container.
--restart always makes sure the container starts again after a reboot or crash.
The -p values open the ports needed by FreeIPA.

Step 3: Enter the Container
To install and configure FreeIPA it needs to go inside the running container.

podman exec -it freeipa-server /bin/bash

Step 4: Prepare the Container
As said in the previous blog, the AlmaLinux image is very minimal. So for those missing folders and configuration files needed, it should be created those required folders, install packages, restore LDAP schema files, and set some security options

# 1. Install foundational packages
dnf install -y ipa-server ipa-server-dns

# 2. Reconstruct missing directory structures
rm -rf /etc/dirsrv /etc/sysconfig /etc/tmpfiles.d /etc/pkcs11
mkdir -p /etc/sysconfig /etc/tmpfiles.d /etc/pkcs11/modules /etc/dirsrv/config
mkdir -p /var/lib/ipa/sysrestore /var/lib/ipa-client/sysrestore /var/log/dirsrv

# 3. Restore missing LDAP schemas and configure cryptographic policies
dnf reinstall -y 389-ds-base --setopt=tsflags=noscripts --setopt=sslverify=false
echo "module: /usr/lib64/libsofthsm2.so" > /etc/pkcs11/modules/softhsm2.module
update-crypto-policies --set LEGACY

# 4. Generate necessary Kerberos configuration placeholders
touch /etc/sysconfig/krb5kdc /etc/sysconfig/kadmin
chmod 644 /etc/sysconfig/krb5kdc /etc/sysconfig/kadmin

# 5. Map local networking and identity alignment
MY_IP=$(hostname -I | awk '{print $1}')
echo -e "127.0.0.1\tlocalhost\n$MY_IP\tipa.example.edu ipa" > /etc/hosts

# 6. Set Java and Certificate Authority environment variables
export JAVA_OPTS="-Djava.security.egd=file:/dev/./urandom -Djava.net.preferIPv4Stack=true"
export NSS_SDB_USE_CACHE=yes

Step 5: Install FreeIPA
Then the FreeIPA installer can be run in unattended mode as the container is now ready.

ipa-server-install \
  --unattended \
  --domain=example.edu \
  --realm=EXAMPLE.EDU \
  --ds-password=<YOUR_DS_PASSWORD> \
  --admin-password=<YOUR_ADMIN_PASSWORD> \
  --no-ntp \
  --no-host-dns \
  --no-pkinit \
  --skip-mem-check

Replace YOUR_DS_PASSWORD and YOUR_ADMIN_PASSWORD with your own secure passwords.

Step 6: Access the Web Interface

Local Access

If the container is on a local system, add this line to the hosts file:

127.0.0.1 ipa.example.edu

Then open the browser:

https://ipa.example.edu

Username: admin
Password: YOUR_ADMIN_PASSWORD

Remote Access via SSH Tunnel

If the container is on a remote server, use an SSH tunnel:

ssh -L 443:localhost:443 -L 80:localhost:80 user@remote-server

Then add the same hosts line locally and open the browser.

Step 7: Verify Setup

Inside the container, verify that FreeIPA and Kerberos are working:

kinit admin
ipa user-show admin

Step 8: Make Port Change Permanent

The earlier port change will reset after a reboot. To keep it:

echo "net.ipv4.ip_unprivileged_port_start=80" | sudo tee -a /etc/sysctl.conf
sudo sysctl -p

Checking FreeIPA Service Status

Testing Kerberos Authentication

推荐订阅源

DEV Community