Operating Systems AWS

AlmaLinux 10.2 on AWS User Guide

| Product: AlmaLinux 10.2 on AWS

Overview

This guide covers launching and verifying the AlmaLinux 10.2 AMI from cloudimg on Amazon EC2. It is one version of the cloudimg AlmaLinux listing on AWS Marketplace; you pick it as the software version when you subscribe and launch. Every release and variant in the listing is described at /guides/almalinux-aws/.

AlmaLinux 10 is a free, community-built enterprise Linux distribution that is binary compatible with Red Hat Enterprise Linux 10, maintained until 2035. This is the standard AlmaLinux 10.2 version of the listing: the full AlmaLinux 10.2 for EC2 package set, with nothing trimmed. What the image gives you:

  • The standard server package set, with current AWS tools. Everything the AlmaLinux 10.2 EC2 image ships stays installed, including the tuned tuning daemon (running the virtual-guest profile) and the sos support-report collector that the Minimal version of this listing removes (Step 4). The out-of-date AWS tools the base image carried outside any repository (an old CloudWatch agent, a bundled AWS CLI and EC2 Instance Connect) are removed, and the Systems Manager agent is brought to its current release.
  • CIS Level 1 Server remediation. The image is remediated with the OpenSCAP CIS Level 1 Server profile from SCAP Security Guide 0.1.82 (AlmaLinux's own signed scap-security-guide package), then rebooted and evaluated. On this build 285 of 286 scored rules pass (99.7%). Seven rules are waived because they cannot work on an EC2 image, each with its reason. The HTML report, the machine-readable results, the waiver list and a summary ship in /usr/share/doc/cloudimg/.
  • EC2 defaults that keep you in control. Key-only SSH as ec2-user, root locked, no password on any account, SELinux enforcing, IMDSv2 required, a host firewall (firewalld) that allows SSH in and everything out, the current AWS Systems Manager agent, and time from the Amazon Time Sync Service.
  • Fully patched at build time, with dnf-automatic applying security updates on your instance.

What is on the image: AlmaLinux 10.2 (the RHEL 10 compatible 6.12 kernel), cloud-init, OpenSSH, firewalld, chrony, tuned, sos, SELinux (targeted policy, enforcing), the AWS Systems Manager agent, auditd, rsyslog, AIDE file integrity checking, dnf-automatic, OpenSCAP and the pinned SCAP Security Guide content used for the evaluation.

Default user: ec2-user · Architecture: x86_64 · Boot mode: UEFI (preferred) · Root volume: 10 GiB gp3, XFS (grows to the size you choose at launch)

Standard or Minimal? Both versions are built the same way on the same day, carry the same hardening and score the same. Choose this standard version if you want the image as AlmaLinux ships it, with tuned applying its virtual-guest tuning and sos ready for a support report. Choose AlmaLinux 10 Minimal if you want the smallest package set and do not need those two tools. Choose AlmaLinux 10 LVM if your benchmark needs separate volumes for /tmp, /var, /var/log and the other CIS mount points.

These images are remediated with an OpenSCAP profile and ship their own evaluation report. They are not CIS Hardened Images, and CIS has not reviewed or certified them.

Connecting to your instance

Version SSH user Root device
AlmaLinux 10.2 ec2-user /dev/sda1 (10 GiB gp3)

Security posture

  • No known credential. There is no default password and no baked in SSH key. The only key that works is the EC2 key pair you choose at launch, which cloud-init installs for ec2-user on first boot.
  • Key-only SSH. PasswordAuthentication no, PermitRootLogin no, keyboard-interactive off. The root account has no password and is locked. EC2 Instance Connect, which adds a second way to push SSH keys, is not installed.
  • Per-instance identity. SSH host keys and the machine ID are generated fresh on every instance, so no two instances share a host key.
  • IMDSv2 required. The AMI is registered with ImdsSupport v2.0, so instances launched from it refuse token-less (IMDSv1) metadata requests by default.
  • SELinux enforcing with the targeted policy, as AlmaLinux ships it.
  • Host firewall. firewalld's public zone allows only SSH and the DHCPv6 client inbound and allows all outbound traffic, so the SSM agent, metadata service, DNS, time and package updates keep working.
  • Only SSH listens on the network. Nothing else on the image listens on any address.

Prerequisites

  1. An AWS account and permission to launch EC2 instances
  2. An EC2 key pair in the Region you launch in
  3. A security group that allows TCP 22 from your own address (not from the whole internet)

Recommended instance type: m5.large. The image runs on any current x86_64 instance type. Like every AlmaLinux 10 build for x86_64, it needs a processor with the x86-64-v3 feature level (AVX2), which current-generation EC2 x86 instance types provide.

Step 1: Launch the instance

Option A: AWS Marketplace console

  1. Open the cloudimg AlmaLinux listing on AWS Marketplace and choose View purchase options, then Subscribe. One subscription covers every version in the listing.
  2. Once the subscription is active, choose Launch your software.
  3. Choose One-click launch from AWS Marketplace (or Launch from EC2 Console for full control), then in Version choose AlmaLinux 10.2 - YYYY-MM-DD (the date is when the version was added) and your Region.
  4. Instance type: m5.large is recommended; any current x86_64 type works. The software charge is $0.04 per vCPU per hour.
  5. Key pair: choose your EC2 key pair. It is the only way in. RSA and ED25519 keys both work.
  6. Security group: allow inbound TCP 22 from your own IP address or network only.
  7. Storage: the root volume is 10 GiB gp3 by default. Choose a larger size if you need one; cloud-init grows the root partition and filesystem to fill it on first boot.
  8. Metadata: leave the defaults. The image already requires IMDSv2. Then choose Launch.

Option B: AWS CLI

Run this on your own workstation. Replace the AMI ID with the one shown for your Region on the Marketplace launch page, and the key pair, security group and subnet with your own. The root device of this AMI is /dev/sda1:

aws ec2 run-instances \
  --image-id ami-0123456789abcdef0 \
  --instance-type m5.large \
  --key-name my-key-pair \
  --security-group-ids sg-0123456789abcdef0 \
  --subnet-id subnet-0123456789abcdef0 \
  --block-device-mappings 'DeviceName=/dev/sda1,Ebs={VolumeSize=20,VolumeType=gp3}' \
  --tag-specifications 'ResourceType=instance,Tags=[{Key=Name,Value=almalinux-10-2}]'

You do not need --metadata-options: the AMI already makes IMDSv2 required.

Step 2: Connect via SSH

From your workstation, connect as ec2-user with the key pair you chose:

ssh -i ~/.ssh/my-key-pair.pem ec2-user@<public-ip>

There is no password to enter. If SSH asks for one, or says Too many authentication failures, see Troubleshooting below.

You can also connect without opening port 22 at all through AWS Systems Manager Session Manager, if the instance has an instance profile that allows Systems Manager. The agent is installed and running on this image.

Step 3: Confirm the release

cat /etc/almalinux-release
grep -E '^(NAME|VERSION|ID|VERSION_ID|PLATFORM_ID|PRETTY_NAME)=' /etc/os-release
uname -srm

Expected output:

AlmaLinux release 10.2 (Lavender Lion)
NAME="AlmaLinux"
VERSION="10.2 (Lavender Lion)"
ID="almalinux"
VERSION_ID="10.2"
PLATFORM_ID="platform:el10"
PRETTY_NAME="AlmaLinux 10.2 (Lavender Lion)"
Linux 6.12.0-211.66.1.el10_2.x86_64 x86_64

Terminal output showing almalinux-release reporting AlmaLinux release 10.2 Lavender Lion, os-release with VERSION_ID 10.2 and platform el10, uname reporting the x86_64 el10_2 kernel, and the standard package set: 423 packages with tuned and sos installed and tuned running the virtual-guest profile

The image is AlmaLinux 10.2 as built. Its repositories are the AlmaLinux 10 release stream ($releasever is 10), and AlmaLinux publishes updates only for the newest minor release, so the instance moves to each later AlmaLinux 10 minor release (10.3 and on) through normal dnf updates, as every AlmaLinux 10 system does. Your kernel version may be newer if updates have installed since this image was built.

Step 4: The standard package set

This version keeps the AlmaLinux 10.2 EC2 package set whole. Two tools that the Minimal version removes are installed and working here:

rpm -qa | wc -l
rpm -q tuned sos
systemctl is-active tuned
tuned-adm active

Expected output (the package versions change over time):

423
tuned-2.27.0-2.el10_2.noarch
sos-4.11.2-4.el10_2.noarch
active
Current active profile: virtual-guest
  • tuned is the system tuning daemon. Its virtual-guest profile, the one tuned-adm recommend picks on EC2, sets memory writeback and swappiness, disk readahead and CPU performance settings for a guest on a hypervisor. To use another profile, list them with tuned-adm list (tuned also ships an aws profile) and switch with, for example, sudo tuned-adm profile throughput-performance.
  • sos collects configuration, logs and diagnostics into one archive (sudo sos report) when a support engineer asks for one.

What the Minimal version drops. AlmaLinux 10 Minimal removes tuned and sos, with the libraries that are only there for them, and lists the removals in /usr/share/doc/cloudimg/minimal-manifest.txt on its own image. A new Minimal instance built the same day has 416 packages against 423 here. Everything else is the same in both versions: the AlmaLinux 10.2 EC2 base image is already small, so neither version has wireless or sound firmware, Cockpit or Plymouth installed, and both carry the same hardening, compliance tooling and AWS agents. The package count on your instance moves by a few as kernels and updates install.

Step 5: Read the compliance evidence

The evaluation the build ran after its reboot ships on the image:

ls -lh /usr/share/doc/cloudimg/
python3 -c "import json; s=json.load(open('/usr/share/doc/cloudimg/cis-l1-summary.json')); print('profile:      ', s['profileLabel'], '(SCAP Security Guide', s['ssgVersion'] + ')'); print('scored rules: ', s['scored'], ' pass:', s['pass'], ' fail:', s['fail'], ' rate:', str(s['ratePct']) + '%'); print('waived:       ', s['waived'], ' not applicable:', s['notapplicable']); print('evaluated at: ', s['evaluatedAt'])"

Expected output:

total 32M
-rw-r--r--. 1 root root  29M Oct 19 16:59 cis-l1-arf.xml
-rw-r--r--. 1 root root 2.4M Oct 19 16:59 cis-l1-report.html
-rw-r--r--. 1 root root 1.2K Oct 19 16:59 cis-l1-summary.json
-rw-r--r--. 1 root root 1.9K Oct 19 16:59 cis-l1-tailoring.xml
-rw-r--r--. 1 root root 2.9K Oct 19 16:59 cis-l1-waivers.txt
-rw-r--r--. 1 root root 1.6K Oct 19 16:56 scap-security-guide-LICENSE.txt
profile:       CIS Level 1 Server (SCAP Security Guide 0.1.82)
scored rules:  286  pass: 285  fail: 1  rate: 99.7%
waived:        7  not applicable: 31
evaluated at:  2026-10-19T16:59:39Z

Terminal output showing the shipped compliance files in /usr/share/doc/cloudimg and the summary: CIS Level 1 Server profile, 286 scored rules, 285 pass, 1 fail, a 99.7 percent pass rate and 7 waived rules

  • cis-l1-report.html is the full OpenSCAP report, rule by rule. Copy it to your workstation and open it in a browser.
  • cis-l1-arf.xml is the same evaluation in the machine-readable ARF format, for compliance tooling.
  • cis-l1-tailoring.xml is the exact tailoring used, so you can re-run the same evaluation (Step 6).
  • The pass rate is pass / (pass + fail + error + unknown). Rules that are not applicable to this machine, not selected, or waived are not counted.

To copy the report to your workstation, run this on the workstation:

scp -i ~/.ssh/my-key-pair.pem ec2-user@<public-ip>:/usr/share/doc/cloudimg/cis-l1-report.html .

The seven waived rules

grep -v '^#' /usr/share/doc/cloudimg/cis-l1-waivers.txt | cut -f1,2

Expected output:

partition_for_tmp   [single-volume-partitions]
grub2_password  [serial-console-and-boot]
ensure_root_password_configured [serial-console-and-boot]
accounts_maximum_age_login_defs [key-only-account-aging]
account_disable_post_pw_expiration  [key-only-account-aging]
sshd_limit_user_access  [ssh-access-list]
service_systemd-journal-upload_enabled  [log-remote-destination]

The full reason for each is the third column of the same file. In short:

  • Separate /tmp partition: this version boots from one EBS root volume. (The LVM versions of this listing provide separate volumes for /tmp, /var, /var/log, /var/log/audit, /var/tmp and /home.)
  • Boot loader and root passwords: a GRUB or root password would have to be baked into the image, giving every instance the same secret. Root stays locked with no password. Set your own if you need serial console access (see Step 11).
  • Password ageing defaults: the accounts cloud-init creates are key-only. An ageing limit would expire them and lock the SSH key out. Accounts that do have a password are still aged.
  • SSH AllowUsers/AllowGroups: a list fixed at build time would refuse accounts you create later. Your security group restricts who can reach port 22.
  • Journal upload to a remote log server: the profile switches on systemd-journal-upload but sets no destination, and an image cannot know your log server. With no destination the service fails at every boot. systemd-journal-remote is installed and the upload service is left off: put URL= for your collector in /etc/systemd/journal-upload.conf, then run sudo systemctl enable --now systemd-journal-upload.

The one rule that does not pass

python3 -c "import json; [print(r) for r in json.load(open('/usr/share/doc/cloudimg/cis-l1-summary.json'))['failingRules']]"

Expected output:

ensure_journald_and_rsyslog_not_active_together

The benchmark wants one logging system, not both. AlmaLinux runs journald and rsyslog together by default: journald keeps the structured system journal (persistent, in /var/log/journal), and rsyslog writes the traditional text logs (/var/log/messages, /var/log/secure, /var/log/cron) that many log shippers and audit procedures read. The image keeps both so neither kind of tooling loses its logs. If you standardise on one, for example the journal only, run sudo systemctl disable --now rsyslog on your instance and re-run Step 6.

Step 6: Re-run the evaluation yourself

You can repeat the evaluation at any time with the same content and tailoring. It takes under a minute:

sudo oscap xccdf eval \
  --tailoring-file /usr/share/doc/cloudimg/cis-l1-tailoring.xml \
  --profile xccdf_co.cloudimg_profile_cis-l1_ec2_single \
  --results /tmp/cis-check-results.xml --report /tmp/cis-check-report.html \
  /usr/share/xml/scap/ssg/content/ssg-almalinux10-ds.xml > /tmp/cis-check.log 2>&1
echo "oscap exit code: $? (2 = at least one rule did not pass)"
sudo python3 -c "import re,collections; c=collections.Counter(re.findall(r'<result>(\w+)</result>', open('/tmp/cis-check-results.xml').read())); s=sum(c[k] for k in ('pass','fail','error','unknown')); print(dict(sorted(c.items()))); print('pass rate: %.1f%%' % (100.0*c['pass']/s))"

Expected output:

oscap exit code: 2 (2 = at least one rule did not pass)
{'fail': 1, 'notapplicable': 31, 'notselected': 756, 'pass': 285}
pass rate: 99.7%

Your own report is at /tmp/cis-check-report.html. As you install software and change settings, re-run this to see how your changes affect the result.

Step 7: Confirm IMDSv2 is required

curl -s -o /dev/null -w 'IMDSv1 request without a token: HTTP %{http_code}\n' http://169.254.169.254/latest/meta-data/instance-id
TOKEN=$(curl -s -X PUT -H 'X-aws-ec2-metadata-token-ttl-seconds: 60' http://169.254.169.254/latest/api/token)
curl -s -H "X-aws-ec2-metadata-token: $TOKEN" -w '\n' http://169.254.169.254/latest/meta-data/placement/region

Expected output (your Region may differ):

IMDSv1 request without a token: HTTP 401
us-east-1

A request without a session token is refused with HTTP 401, and the same request with a token works. Scripts and SDKs on the instance must use IMDSv2; every current AWS SDK and the AWS CLI do this automatically.

Step 8: The host firewall and listening ports

sudo firewall-cmd --state
sudo firewall-cmd --list-all
sudo ss -tlnp

Expected output:

running
public (default, active)
  target: default
  ingress-priority: 0
  egress-priority: 0
  icmp-block-inversion: no
  interfaces: eth0
  sources: 
  services: dhcpv6-client ssh
  ports: 
  protocols: 
  forward: yes
  masquerade: no
  forward-ports: 
  source-ports: 
  icmp-blocks: 
  rich rules: 
State  Recv-Q Send-Q Local Address:Port Peer Address:PortProcess                        
LISTEN 0      128          0.0.0.0:22        0.0.0.0:*    users:(("sshd",pid=1278,fd=7))
LISTEN 0      128             [::]:22           [::]:*    users:(("sshd",pid=1278,fd=8))

Terminal output showing firewalld running with the public zone on eth0 allowing only the dhcpv6-client and ssh services and no ports or rich rules, sshd as the only listening TCP socket, and a token-less IMDSv1 request refused with HTTP 401

  • Only sshd listens, on port 22. Nothing else on the image opens a TCP port.
  • The public zone allows ssh and dhcpv6-client (replies to the instance's IPv6 DHCP client, which is how an instance in an IPv6-enabled subnet gets its address). The AlmaLinux default cockpit service is removed from the zone; Cockpit is not installed.
  • The loopback interface sits in firewalld's trusted zone, with rules that drop traffic claiming a loopback source from anywhere else (a CIS requirement).

Opening a port for your own service takes two steps: allow it in the instance's security group, and allow it in firewalld. For example, for a web server on 443, run on the instance:

sudo firewall-cmd --permanent --add-service=https
sudo firewall-cmd --reload

If a port is open in the security group but not in firewalld (or the other way round), the traffic will not arrive.

Step 9: Time sync and the Systems Manager agent

systemctl is-active chronyd amazon-ssm-agent
chronyc -n sources

Expected output (the pool servers and timings vary):

active
active
MS Name/IP address         Stratum Poll Reach LastRx Last sample               
===============================================================================
^- 23.186.168.130                2   6    35    25   +169us[ +205us] +/-   54ms
^- 23.157.100.123                2   6    17    27   -734us[ -697us] +/-   33ms
^- 45.33.103.94                  3   6    17    28    -65us[  -28us] +/-   17ms
^- 193.163.204.113               2   6    17    27   +372us[ +409us] +/- 4378us
^* 169.254.169.123               3   4    37    13  +8124ns[  +45us] +/-  484us

The ^* marks the source chrony is using: 169.254.169.123, the Amazon Time Sync Service. It is reachable from every instance without internet access, so time stays correct in a private subnet too. The public AlmaLinux pool servers are fallbacks.

The AWS Systems Manager agent is installed from Amazon's own package at its current release (3.3.5390.0 on this build). It is not in the AlmaLinux repositories, so dnf does not update it; Systems Manager can keep it current for you (the AWS-UpdateSSMAgent document, or the Auto update SSM Agent setting in Fleet Manager).

Step 10: Patch level and automatic updates

The image is fully patched at build time. Check what is pending now:

sudo dnf -q check-update --refresh
echo "dnf check-update exit code: $? (0 = nothing to update, 100 = updates available)"
grep -E '^(upgrade_type|apply_updates)' /etc/dnf/automatic.conf
systemctl is-enabled dnf-automatic.timer
uname -r

Expected output on an instance launched soon after the image was built (later launches list the updates released since, with exit code 100):

dnf check-update exit code: 0 (0 = nothing to update, 100 = updates available)
upgrade_type = security
apply_updates = yes
enabled
6.12.0-211.66.1.el10_2.x86_64

dnf-automatic runs daily (06:00, with a random delay of up to an hour) and installs security updates automatically. To update everything now, run:

sudo dnf -y upgrade

Reboot if a new kernel was installed:

sudo systemctl reboot

Step 11: Security settings on the instance

getenforce
sudo passwd -S root
sudo sshd -T | grep -E '^(permitrootlogin|passwordauthentication|pubkeyauthentication|maxauthtries|clientaliveinterval|banner) '
cat /etc/issue.net

Expected output:

Enforcing
root L 2024-12-14 0 99999 7 -1
maxauthtries 4
clientaliveinterval 300
permitrootlogin no
pubkeyauthentication yes
passwordauthentication no
banner /etc/issue.net
Authorized users only. All activity may be monitored and reported.

Terminal output showing SELinux enforcing, the root account locked, the effective SSH settings with root login and password authentication off and the login banner, chrony and the SSM agent active, and chrony synchronised to the Amazon Time Sync Service at 169.254.169.123

  • Enforcing means SELinux is on and enforcing the targeted policy. Keep it on; if your own software is denied, check sudo ausearch -m avc -ts recent rather than disabling SELinux.
  • L in the second column means the root account is locked.
  • maxauthtries 4 and clientaliveinterval 300 come from the CIS profile: SSH allows four authentication attempts per connection and checks idle sessions every five minutes.
  • The banner text is shown before login.

EC2 Serial Console and recovery. No account on this image has a password, so the serial console cannot log in until you set one. If you want serial console access, set a password for your own user on your running instance (the password is yours and is not on the image):

sudo passwd ec2-user

Step 12: Disk size, swap and file integrity

df -hT /
sudo grep -E 'cc_growpart.*(resized|NOCHANGE)' /var/log/cloud-init.log | tail -1
swapon --noheadings --show | wc -l
sudo grep -h aide /etc/crontab

Expected output with the default 10 GiB root volume (on a larger volume, Size is larger and the cloud-init line says resized):

Filesystem     Type  Size  Used Avail Use% Mounted on
/dev/nvme0n1p4 xfs   8.8G  1.5G  7.3G  17% /
2026-10-19 17:15:38,396 - cc_growpart.py[DEBUG]: '/' NOCHANGE: no change necessary (/dev/nvme0n1, 4)
0
05 4 * * * root /usr/sbin/aide --check
  • Disk layout. The instance boots with UEFI. The root filesystem is XFS on partition 4 of the root volume; /boot (XFS) and /boot/efi are separate small partitions.
  • Disk growth. cloud-init grows the root partition and filesystem to the volume size on first boot. To grow later, increase the EBS volume size in the console or with aws ec2 modify-volume, then run sudo growpart /dev/nvme0n1 4 && sudo xfs_growfs / (or reboot).
  • Swap. The image has no swap. Add a swap file yourself if your workload needs one.
  • AIDE. The file integrity database is built from the image's own files, and the CIS profile schedules aide --check daily at 04:05 from /etc/crontab.

Step 13: Install software and add users

The instance uses the standard AlmaLinux 10 repositories (BaseOS, AppStream, CRB and Extras):

sudo dnf -q list --available nginx

Expected output (the version changes over time):

Available Packages
nginx.x86_64                    2:1.26.3-6.el10_2.7                    appstream

Install and start software in the usual way, for example sudo dnf -y install nginx then sudo systemctl enable --now nginx, and open its port in the security group and firewalld (Step 8). The AWS CLI is not on the image; install the current version from AWS (the AWS CLI install guide) if you need it.

To add another administrator, create the account, add it to the wheel group and give it an SSH key:

sudo useradd -m -G wheel alice
sudo install -d -m 700 -o alice -g alice /home/alice/.ssh
echo "ssh-ed25519 AAAA... alice@laptop" | sudo tee /home/alice/.ssh/authorized_keys
sudo chown alice:alice /home/alice/.ssh/authorized_keys && sudo chmod 600 /home/alice/.ssh/authorized_keys
sudo restorecon -R /home/alice/.ssh

Because SSH is key-only, a new account needs its key in authorized_keys (and restorecon gives the file the SELinux label sshd expects). The new account has no password, so sudo cannot authenticate it until you give it one with sudo passwd alice. SSH stays key-only; the password is used by sudo. (Only ec2-user, created by cloud-init, has password-free sudo.)

Common use cases

  • A base for workloads that must show CIS Level 1 alignment on an enterprise Linux 10, with the evaluation report already on the machine
  • Software certified or packaged for RHEL 10 compatible systems, with SELinux enforcing from the first boot
  • General-purpose servers and container hosts that want AlmaLinux's own tuning and support tooling (tuned, sos) on a base supported until 2035
  • Fleets managed through Systems Manager, with IMDSv2 required from the first boot
  • A starting point for your own golden image: add your software, re-run Step 6, and keep the report with your build

Troubleshooting

SSH says "Too many authentication failures"

The SSH server allows four authentication attempts per connection. If your SSH agent holds several keys, it can use them up before it offers the right one. Tell SSH to offer only the key you name:

ssh -o IdentitiesOnly=yes -i ~/.ssh/my-key-pair.pem ec2-user@<public-ip>

Cannot connect via SSH

  1. Check the instance is running and has passed its status checks.
  2. Check the security group allows TCP 22 from your current public address.
  3. Use the user name ec2-user and the key pair chosen at launch. Password login is disabled, so a wrong key never falls back to a password prompt.
  4. If you changed firewalld, make sure the ssh service is still allowed. Session Manager (Step 2) still works if SSH is blocked, provided the instance has a Systems Manager instance profile.

The instance does not boot on an older instance type

AlmaLinux 10 for x86_64 is built for the x86-64-v3 feature level. Very old instance families whose processors lack AVX2 cannot run it; choose a current-generation type such as m5, m6i, m7i, c6i or t3.

My service is running but not reachable

Allow the port in both the security group and firewalld (Step 8). sudo firewall-cmd --list-all shows the firewalld rules; sudo ss -tlnp shows whether the service listens on all addresses or only on loopback. If the service runs on a non-standard port, SELinux may also need to allow it: install the SELinux management tools with sudo dnf -y install policycoreutils-python-utils, then, for example, sudo semanage port -a -t http_port_t -p tcp 8080 for a web server on 8080.

A tool that uses instance metadata fails

The image requires IMDSv2. Old scripts that call http://169.254.169.254/ without a token get HTTP 401. Update them to request a token first (Step 7), or use the AWS CLI or a current SDK.

Package manager issues

Refresh the metadata first:

sudo dnf -q makecache --refresh && echo "repository metadata refreshed"

If the repositories are unreachable, check that the instance has outbound internet access (a public IP or a NAT gateway) and that DNS resolves:

getent hosts repo.almalinux.org

Important notes

AlmaLinux is free and open source software. It is a distribution of thousands of packages, each under its own licence (GPL, LGPL, MIT, BSD, Apache 2.0 and others); rpm -qi <package> shows each package's licence. No subscription or licence key is needed to run this image. The compliance tooling is OpenSCAP (LGPL 2.1 or later) and SCAP Security Guide content (BSD 3-Clause, licence text in /usr/share/doc/cloudimg/scap-security-guide-LICENSE.txt).

AlmaLinux 10 is maintained by the AlmaLinux OS Foundation until 2035. This version tracks the AlmaLinux 10 release stream, so new minor releases arrive as ordinary updates.

The CIS Level 1 Server profile used here is the OpenSCAP profile published in SCAP Security Guide. These images are not CIS Hardened Images and are not certified by the Center for Internet Security. A pass rate measures this image as built; your own changes affect it, which is why the evaluation can be re-run (Step 6).

AlmaLinux is a trademark of the AlmaLinux OS Foundation. Red Hat Enterprise Linux is a trademark of Red Hat, Inc. CIS is a trademark of the Center for Internet Security. These names are used only to identify the software, its compatibility and the profile. cloudimg is not affiliated with or endorsed by the AlmaLinux OS Foundation, Red Hat or the Center for Internet Security.

Support

For help with this image, contact cloudimg support: