missing kernel config check about k3s

[mdrahman-suse]

Validated on master branch with commit cff6f7a

Environment

$ uname -a
Linux server1 6.2.0-1012-aws #12~22.04.1-Ubuntu SMP Thu Sep  7 16:00:15 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux

Single server

Testing

• Install k3s
• Ensure cluster is up and running
• Run k3s check-config
• Validate CONFIG_IP_NF_TARGET_REJECT is present and enabled

Replication

$ k3s -v
k3s version v1.30.1+k3s1 (80978b5b)
go version go1.22.2

$ k3s check-config
cat: /sys/kernel/security/apparmor/profiles: Permission denied

Verifying binaries in /var/lib/rancher/k3s/data/019fb8bac4d619f2f3682a8aef4f460c4759bd4d1510b12b05b498936e75da14/bin:
- sha256sum: good
- links: good

System:
- /usr/sbin iptables v1.8.7 (nf_tables): ok
- swap: disabled
- routes: ok

Limits:
- /proc/sys/kernel/keys/root_maxkeys: 1000000

modprobe: FATAL: Module configs not found in directory /lib/modules/6.2.0-1012-aws
info: reading kernel config from /boot/config-6.2.0-1012-aws ...

Generally Necessary:
- cgroup hierarchy: cgroups V2 mounted, cpu|cpuset|memory controllers status: good
- /usr/sbin/apparmor_parser
apparmor: enabled and tools installed
- CONFIG_NAMESPACES: enabled
- CONFIG_NET_NS: enabled
- CONFIG_PID_NS: enabled
- CONFIG_IPC_NS: enabled
- CONFIG_UTS_NS: enabled
- CONFIG_CGROUPS: enabled
- CONFIG_CGROUP_PIDS: enabled
- CONFIG_CGROUP_CPUACCT: enabled
- CONFIG_CGROUP_DEVICE: enabled
- CONFIG_CGROUP_FREEZER: enabled
- CONFIG_CGROUP_SCHED: enabled
- CONFIG_CPUSETS: enabled
- CONFIG_MEMCG: enabled
- CONFIG_KEYS: enabled
- CONFIG_VETH: enabled (as module)
- CONFIG_BRIDGE: enabled (as module)
- CONFIG_BRIDGE_NETFILTER: enabled (as module)
- CONFIG_IP_NF_FILTER: enabled (as module)
- CONFIG_IP_NF_TARGET_MASQUERADE: enabled (as module)
- CONFIG_NETFILTER_XT_MATCH_ADDRTYPE: enabled (as module)
- CONFIG_NETFILTER_XT_MATCH_CONNTRACK: enabled (as module)
- CONFIG_NETFILTER_XT_MATCH_IPVS: enabled (as module)
- CONFIG_NETFILTER_XT_MATCH_COMMENT: enabled (as module)
- CONFIG_NETFILTER_XT_MATCH_MULTIPORT: enabled (as module)
- CONFIG_IP_NF_NAT: enabled (as module)
- CONFIG_NF_NAT: enabled (as module)
- CONFIG_POSIX_MQUEUE: enabled
...
STATUS: pass

Validation

$ k3s -v
k3s version v1.30.1+k3s-cff6f7aa (cff6f7aa)
go version go1.22.2

$ k3s check-config
cat: /sys/kernel/security/apparmor/profiles: Permission denied

Verifying binaries in /var/lib/rancher/k3s/data/93dbdeb1dc09ec65c4f3c32bec85f633fc72dd538f97dddd1607d03b428bb994/bin:
- sha256sum: good
- links: good

System:
- /usr/sbin iptables v1.8.7 (nf_tables): ok
- swap: disabled
- routes: ok

Limits:
- /proc/sys/kernel/keys/root_maxkeys: 1000000

modprobe: FATAL: Module configs not found in directory /lib/modules/6.2.0-1012-aws
info: reading kernel config from /boot/config-6.2.0-1012-aws ...

Generally Necessary:
- cgroup hierarchy: cgroups V2 mounted, cpu|cpuset|memory controllers status: good
- /usr/sbin/apparmor_parser
apparmor: enabled and tools installed
- CONFIG_NAMESPACES: enabled
- CONFIG_NET_NS: enabled
- CONFIG_PID_NS: enabled
- CONFIG_IPC_NS: enabled
- CONFIG_UTS_NS: enabled
- CONFIG_CGROUPS: enabled
- CONFIG_CGROUP_PIDS: enabled
- CONFIG_CGROUP_CPUACCT: enabled
- CONFIG_CGROUP_DEVICE: enabled
- CONFIG_CGROUP_FREEZER: enabled
- CONFIG_CGROUP_SCHED: enabled
- CONFIG_CPUSETS: enabled
- CONFIG_MEMCG: enabled
- CONFIG_KEYS: enabled
- CONFIG_VETH: enabled (as module)
- CONFIG_BRIDGE: enabled (as module)
- CONFIG_BRIDGE_NETFILTER: enabled (as module)
- CONFIG_IP_NF_FILTER: enabled (as module)
- CONFIG_IP_NF_TARGET_MASQUERADE: enabled (as module)
- CONFIG_IP_NF_TARGET_REJECT: enabled (as module)
- CONFIG_NETFILTER_XT_MATCH_ADDRTYPE: enabled (as module)
- CONFIG_NETFILTER_XT_MATCH_CONNTRACK: enabled (as module)
- CONFIG_NETFILTER_XT_MATCH_IPVS: enabled (as module)
- CONFIG_NETFILTER_XT_MATCH_COMMENT: enabled (as module)
- CONFIG_NETFILTER_XT_MATCH_MULTIPORT: enabled (as module)
- CONFIG_IP_NF_NAT: enabled (as module)
- CONFIG_NF_NAT: enabled (as module)
- CONFIG_POSIX_MQUEUE: enabled
...
STATUS: pass