티스토리 뷰

Cloud/Kubernetes

K3s

Jacob_baek 2019. 11. 17. 23:27

K3s 란

가벼운 Kubernetes로 쉽게 설치하고 적은 메모리/binary 파일을 사용하여 Edge/IoT 환경 혹은 CI/Dev 환경에서 k8s를 쉽게 사용할 수 있도록 도와주는 도구이다.

https://github.com/k3s-io/k3s

installation

K3s 설치

설치는 간단하다. 아래와 같이 shell script를 제공하며 바로 다운받아 설치를 진행한다.

[root@deploy ~]# curl -sfL https://get.k3s.io | sh -
[INFO]  Finding release for channel stable
[INFO]  Using v1.20.2+k3s1 as release
[INFO]  Downloading hash https://github.com/rancher/k3s/releases/download/v1.20.2+k3s1/sha256sum-amd64.txt
[INFO]  Downloading binary https://github.com/rancher/k3s/releases/download/v1.20.2+k3s1/k3s
...

설치후에 아래와 같은 경로에 kubeconfig 파일에 해당되는 yaml파일이 존재하게 된다.

[root@deploy ~]# cat /etc/rancher/k3s/k3s.yaml
apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: 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
    server: https://127.0.0.1:6443
    ...

다음과 같이 VERSION과 kubeconfig MODE를 지정해서 원하는 환경과 kubeconfig 사용시 operation not permitted 이슈를 사전에 방지해놓는다.

jacob@jacob-laptop:~$ curl -sfL https://get.k3s.io | INSTALL_K3S_VERSION=v1.19.7+k3s1 K3S_KUBECONFIG_MODE="644" sh -s -
[INFO]  Using v1.19.7+k3s1 as release
[INFO]  Downloading hash https://github.com/rancher/k3s/releases/download/v1.19.7+k3s1/sha256sum-amd64.txt
[INFO]  Downloading binary https://github.com/rancher/k3s/releases/download/v1.19.7+k3s1/k3s
[INFO]  Verifying binary download
[INFO]  Installing k3s to /usr/local/bin/k3s
[INFO]  Skipping /usr/local/bin/kubectl symlink to k3s, command exists in PATH at /snap/bin/kubectl
...

k3s는 daemon 형태로 동작되며

[root@jacob-deploy ~]#  systemctl status k3s
● k3s.service - Lightweight Kubernetes
   Loaded: loaded (/etc/systemd/system/k3s.service; enabled; vendor preset: disabled)
   Active: active (running) since Mon 2021-02-08 09:48:45 KST; 30min ago
     Docs: https://k3s.io
  Process: 1470 ExecStartPre=/sbin/modprobe overlay (code=exited, status=0/SUCCESS)
  Process: 1468 ExecStartPre=/sbin/modprobe br_netfilter (code=exited, status=0/SUCCESS)
 Main PID: 1473 (k3s-server)
    Tasks: 167
   Memory: 735.6M
   CGroup: /system.slice/k3s.service
           ├─1473 /usr/local/bin/k3s server
           ├─1502 containerd
           ├─1953 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/cont...
           ├─1965 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/cont...
           ├─2174 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/cont...
           ├─2853 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/cont...
           ├─2899 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/cont...
           ├─2927 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/cont...
           ├─2961 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/cont...
           ├─2975 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/cont...
           ├─2989 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/cont...
           └─3129 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/cont...

Feb 08 10:17:11 jacob-deploy k3s[1473]: E0208 10:17:11.529073    1473 sample_and_watermark.go:200] Time went bac...nly"}
Feb 08 10:17:42 jacob-deploy k3s[1473]: E0208 10:17:42.183386    1473 sample_and_watermark.go:200] Time went bac...nly"}
Feb 08 10:17:42 jacob-deploy k3s[1473]: E0208 10:17:42.184526    1473 sample_and_watermark.go:200] Time went bac...nly"}
Feb 08 10:18:12 jacob-deploy k3s[1473]: E0208 10:18:12.834310    1473 sample_and_watermark.go:200] Time went bac...igh"}
Feb 08 10:18:12 jacob-deploy k3s[1473]: E0208 10:18:12.836101    1473 sample_and_watermark.go:200] Time went bac...nly"}
Feb 08 10:18:12 jacob-deploy k3s[1473]: E0208 10:18:12.836493    1473 sample_and_watermark.go:200] Time went bac...igh"}
Feb 08 10:18:12 jacob-deploy k3s[1473]: E0208 10:18:12.836890    1473 sample_and_watermark.go:200] Time went bac...nly"}
Feb 08 10:18:12 jacob-deploy k3s[1473]: E0208 10:18:12.837370    1473 sample_and_watermark.go:200] Time went bac...nly"}
Feb 08 10:18:43 jacob-deploy k3s[1473]: E0208 10:18:43.492053    1473 sample_and_watermark.go:200] Time went bac...igh"}
Feb 08 10:18:43 jacob-deploy k3s[1473]: E0208 10:18:43.492692    1473 sample_and_watermark.go:200] Time went bac...igh"}
Hint: Some lines were ellipsized, use -l to show in full.

실제 동작되는 k3s process는 다음과 같다.

[root@jacob-deploy ~]# ps -ef | grep k3s
root      1473     1 11 09:48 ?        00:03:23 /usr/local/bin/k3s server
root      1953     1  0 09:48 ?        00:00:00 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/containerd-shim-runc-v2 -namespace k8s.io -id 7a4df6840b499f5cad5104299569277593fafb418d5d08c299b43273434a5bf1 -address /run/k3s/containerd/containerd.sock
root      1965     1  0 09:48 ?        00:00:00 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/containerd-shim-runc-v2 -namespace k8s.io -id aab1841a0cf579b471d14f2dd8ff95deb7fb92e49e54154d012b46f7aa96def7 -address /run/k3s/containerd/containerd.sock
root      2174     1  0 09:48 ?        00:00:00 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/containerd-shim-runc-v2 -namespace k8s.io -id 6421b6948dc2cb601c2ee2107713e84044acd3cb6a56fa7786050511c2dbc029 -address /run/k3s/containerd/containerd.sock
root      2853     1 21 09:48 ?        00:06:17 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/containerd-shim-runc-v2 -namespace k8s.io -id 5d3e60aaf3b996784e21ecefa684eee14e37e6e584f4335f609d4b53ed518186 -address /run/k3s/containerd/containerd.sock
root      2899     1  0 09:48 ?        00:00:00 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/containerd-shim-runc-v2 -namespace k8s.io -id 42808a68a20ad393734b20e69c4eb4271685e03a4690f655068581623c81dd79 -address /run/k3s/containerd/containerd.sock
root      2927     1  0 09:48 ?        00:00:00 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/containerd-shim-runc-v2 -namespace k8s.io -id 54344b06545c9929527fc29ff6d0bcd3e4424aaf776f5472b8f35ce70590dfd6 -address /run/k3s/containerd/containerd.sock
root      2961     1  0 09:48 ?        00:00:00 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/containerd-shim-runc-v2 -namespace k8s.io -id 36daee693c2eb2f53bef6d52b13e0c4f079dd69211cc33c06cf4b76421f01c94 -address /run/k3s/containerd/containerd.sock
root      2975     1  0 09:48 ?        00:00:00 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/containerd-shim-runc-v2 -namespace k8s.io -id e70dff7ce8881047fca25bef1ce1d28b81bebd5ac90e505d9abf801ba8105cda -address /run/k3s/containerd/containerd.sock
root      2989     1  0 09:48 ?        00:00:00 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/containerd-shim-runc-v2 -namespace k8s.io -id ee0098d9fb799b29f13dc4d64e19c4169ee0f6a72ba9a393b0bee65d196f763b -address /run/k3s/containerd/containerd.sock
root      3129     1  0 09:48 ?        00:00:00 /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin/containerd-shim-runc-v2 -namespace k8s.io -id 0bbf90678bdd219d3318574c7c1e11227347a352831b5372bb19

아래와 같이 변수를 추가하여 설치를 custom 하게 수행할 수 있다.

[root@deploy ~]# curl -sfL https://get.k3s.io | INSTALL_K3S_VERSION=v1.19.7+k3s1 K3S_KUBECONFIG_MODE="644" INSTALL_K3S_EXEC="--no-deploy traefik" sh -s -

실제 환경변수들을 https://get.k3s.io 다운로드시 파일로 다운로드 받아보면 확인할 수 있다.
대표적인 환경변수들은 아래에서 확인가능하다.

INSTALL_K3S_NAME : systemd service 이름
INSTALL_K3S_EXEC : 다음과 같이 수행 (INSTALL_K3S_EXEC="server --disable=traefik" sh -s -)
INSTALL_K3S_VERSION : 버전 지정
참고 :

node 추가

만약 worker node를 추가하고자 한다면 아래 명령과 같이 master로 동작될 node의 token을 확인하고 worker로 동작될 node에 해당 token을 이용해 설치를 진행하면 된다.

[root@deploy ~]# cat /var/lib/rancher/k3s/server/node-token
K1086931532f8555e790c7ba8962eeaf4ee1a38e5f5855cd081601060c12f0e9015::server:7f9d963be595cda2a96914ff58d8a3d1
...
[root@node1 ~]# curl -sfL https://get.k3s.io | K3S_URL=https://192.168.56.5:6443 K3S_TOKEN=K1086931532f8555e790c7ba8962eeaf4ee1a38e5f5855cd081601060c12f0e9015::server:7f9d963be595cda2a96914ff58d8a3d1 sh -

https://rancher.com/docs/k3s/latest/en/quick-start/#install-script

만약 기존 k3s설치시 버전을 지정했다면 버전을 맞추기 위해 node 추가 과정에서도 추가해주도록 한다.

curl -sfL https://get.k3s.io | INSTALL_K3S_VERSION=v1.19.7+k3s1 K3S_URL=https://192.168.1.1:6443 K3S_TOKEN=xxxxxxxxx sh -

실제 배포가 된뒤 node를 확인하면 추가된 node가 확인된다.

root@node1:~# kubectl get nodes
NAME       STATUS   ROLES    AGE     VERSION
node1   Ready    master   22h     v1.19.7+k3s1
node2   Ready    <none>   4m36s   v1.19.7+k3s1

설정 확인 및 기타 명령들

k3s 설정확인은 다음과 같은 명령을 통해서 해볼수 있다.

root@localhost:~# k3s check-config

Verifying binaries in /var/lib/rancher/k3s/data/8f4b194129852507eab4a55117fc942e0688ec9a70ffdaa5911ccc6652220f76/bin:
- sha256sum: good
- links: good

System:
- /usr/sbin iptables v1.8.4 (legacy): ok
- swap: disabled
- routes: default CIDRs 10.42.0.0/16 or 10.43.0.0/16 already routed

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

modprobe: FATAL: Module configs not found in directory /lib/modules/5.4.0-62-generic
info: reading kernel config from /boot/config-5.4.0-62-generic ...

Generally Necessary:
- cgroup hierarchy: properly mounted [/sys/fs/cgroup]
- /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_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_IP_NF_NAT: enabled (as module)
- CONFIG_NF_NAT: enabled (as module)
- CONFIG_POSIX_MQUEUE: enabled

Optional Features:
- CONFIG_USER_NS: enabled
- CONFIG_SECCOMP: enabled
- CONFIG_CGROUP_PIDS: enabled
- CONFIG_BLK_CGROUP: enabled
- CONFIG_BLK_DEV_THROTTLING: enabled
- CONFIG_CGROUP_PERF: enabled
- CONFIG_CGROUP_HUGETLB: enabled
- CONFIG_NET_CLS_CGROUP: enabled (as module)
- CONFIG_CGROUP_NET_PRIO: enabled
- CONFIG_CFS_BANDWIDTH: enabled
- CONFIG_FAIR_GROUP_SCHED: enabled
- CONFIG_RT_GROUP_SCHED: missing
- CONFIG_IP_NF_TARGET_REDIRECT: enabled (as module)
- CONFIG_IP_SET: enabled (as module)
- CONFIG_IP_VS: enabled (as module)
- CONFIG_IP_VS_NFCT: enabled
- CONFIG_IP_VS_PROTO_TCP: enabled
- CONFIG_IP_VS_PROTO_UDP: enabled
- CONFIG_IP_VS_RR: enabled (as module)
- CONFIG_EXT4_FS: enabled
- CONFIG_EXT4_FS_POSIX_ACL: enabled
- CONFIG_EXT4_FS_SECURITY: enabled
- Network Drivers:
  - "overlay":
    - CONFIG_VXLAN: enabled (as module)
      Optional (for encrypted networks):
      - CONFIG_CRYPTO: enabled
      - CONFIG_CRYPTO_AEAD: enabled
      - CONFIG_CRYPTO_GCM: enabled
      - CONFIG_CRYPTO_SEQIV: enabled
      - CONFIG_CRYPTO_GHASH: enabled
      - CONFIG_XFRM: enabled
      - CONFIG_XFRM_USER: enabled (as module)
      - CONFIG_XFRM_ALGO: enabled (as module)
      - CONFIG_INET_ESP: enabled (as module)
      - CONFIG_INET_XFRM_MODE_TRANSPORT: missing
- Storage Drivers:
  - "overlay":
    - CONFIG_OVERLAY_FS: enabled (as module)

STATUS: pass

아래와 같이 /etc/rancher/k3s/ 디렉토리내에 kubeconfig 파일을 확인할 수 있다.

root@localhost:~# kubectl --kubeconfig /etc/rancher/k3s/k3s.yaml get nodes
NAME       STATUS   ROLES                  AGE   VERSION
service1   Ready    control-plane,master   11h   v1.20.2+k3s1

별도의 옵션 없이 kubectl을 사용하고자 한다면 아래와 같이 복사를 하여 사용하자.

root@localhost:~# cp /etc/rancher/k3s/k3s.yaml ~/.kube/config
root@localhost:~# kubectl get po
No resources found in default namespace.

별도의 옵션 없이 script을 통한 k3s install을 하게 되면 ingress 용도의 Treafik이 설치된다.

https://rancher.com/blog/2020/deploy-an-ingress-controllers

실제 container 들을 확인해보고 싶다면 default runtime인 containerd를 통해 확인해볼수 있다.

root@deploy:~# ctr containers list
CONTAINER                                                           IMAGE                                                                      RUNTIME
08d273eee9dd93379fd6b7f84d2911bcbd8d521a3cd34ddf8a3c60b4b651755a    docker.io/rancher/klipper-lb:v0.1.2                                        io.containerd.runc.v2
0ecc6631cb565b0de3176eb4dce87de7cc0cd81ff94f7234f6305eefe8e58caa    docker.io/rancher/pause:3.1                                                io.containerd.runc.v2
13799fd9747bca4abc85d50e462feda66f71f0b43afdbf46ac9361d9ffea7e5b    docker.io/longhornio/longhorn-instance-manager:v1_20201216                 io.containerd.runc.v2
2c7ab3466c5c5e75fa170e06828e386095b90572697347f81313f783b2b189e6    docker.io/longhornio/longhorn-manager:v1.1.0                               io.containerd.runc.v2
3b074f38000848d9bf85411c61bf18f64c86e29a8de9f78b0ddce566b215880a    sha256:9533374f65a25ecf6bf99daccf5e40431445a1fb9be3ac14a9bbdc5f638db361    io.containerd.runc.v2
416c17990970ed8742b1107b0ba16a1e84f9565b4f3085c9dd9368bb5d592f12    docker.io/longhornio/longhorn-manager:v1.1.0                               io.containerd.runc.v2
61cb0e0adce7cb8351f7be08485c72e6b7755b7d835743483f073a2112974186    sha256:3a555222b6ae444f7a6a1bd73c1da0b4cd5bf942335ac1da76a88469ab0fe3eb    io.containerd.runc.v2
81f9906e9d7afaffd5a1c9ee5664f2f2a59c1fb5091379d9192b6b6ba9e8c7dc    docker.io/rancher/pause:3.1                                                io.containerd.runc.v2
9403867bbc6450cc4e1bb87e410f41a5e67bb1719417e4e0e974698c94aa4dab    docker.io/longhornio/longhorn-engine:v1.1.0                                io.containerd.runc.v2
b6def6a2e1a5f06b0e247ac03d33480529d4434778ef00711b17b1d3e168ec34    docker.io/rancher/pause:3.1                                                io.containerd.runc.v2
d0855797a7a57b315ad4fa25fb72c9dedb9f695c0cf7bf56719b4ec91fe7cf8a    docker.io/longhornio/longhorn-instance-manager:v1_20201216                 io.containerd.runc.v2
d0ecab883e4972ade3fa28c65014e88e17d337e88274966c322039299a9f0c3c    docker.io/rancher/pause:3.1                                                io.containerd.runc.v2
f2efaba550d9378dfc7924bdba797c0a2144546a3dd40ccb78f0f23d884ad1b1    docker.io/rancher/pause:3.1                                                io.containerd.runc.v2
fa55f117f8a7472bfef940dc2ff112d8222d3a702f5ad934fec55be5c218a41f    docker.io/rancher/pause:3.1                                                io.containerd.runc.v2
fde91929f839a454f3da77b97e60d9eff5875e1436b5be484429d978179d51db    docker.io/rancher/pause:3.1                                                io.containerd.runc.v2

https://github.com/projectatomic/containerd/blob/master/docs/cli.md

참고로 K3d라는 Project도 있으며 이는 다수의 K3s를 docker 기반으로 빠르게 환경을 구성해주는 도구이다.
즉, containerized k3s cluster를 구성해준다. 운영보다는 로컬 기반의 개발/테스트용도로 보인다.

https://github.com/rancher/k3d

기본 구성

storage class

기본적으로 local path provisioner로 volume 생성을 할수 있도록 기본 설치된다.

root@deploy:~# kubectl get sc
NAME                   PROVISIONER             RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
local-path (default)   rancher.io/local-path   Delete          WaitForFirstConsumer   false                  16h

https://github.com/rancher/local-path-provisioner

다음 명령을 통해 생성을 확인해볼수 있다.
(아래 예제는 pvc만 생성하면 pending 상태로 대기하게 된다. pod까지 생성해야 volume생성을 확인할 수 있다. 경로는 default 경로인 /var/lib/rancher/k3s/storage 이다.)

kubectl create -f https://raw.githubusercontent.com/rancher/local-path-provisioner/master/examples/pvc/pvc.yaml
kubectl create -f https://raw.githubusercontent.com/rancher/local-path-provisioner/master/examples/pod/pod.yaml

참고로 Longhorn으로도 동작이 잘된다.

https://mr100do.tistory.com/1160

ingress

기본으로 treafik이 설치되도록 되어 있다.
설치 과정중에 treafik을 제외시킬수도 있고 설치후 helm을 이용해 삭제할 수도 있다.

CNI

flannel이 기본 설치된다.

https://rancher.com/docs/k3s/latest/en/installation/network-options/

아래 네트워크 정보와 같이 flannel interface를 확인할 수 있다.

root@service1:~# ip link | more -10
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 52:54:00:3e:82:a7 brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 52:54:00:ca:af:94 brd ff:ff:ff:ff:ff:ff
4: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN mode DEFAULT group default
    link/ether 0a:d7:66:12:91:63 brd ff:ff:ff:ff:ff:ff
5: cni0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UP mode DEFAULT group default qlen 1000
    link/ether 62:99:42:14:0e:7f brd ff:ff:ff:ff:ff:ff

그외 명령들

[root@deploy ~]# which k3s-uninstall.sh
/usr/local/bin/k3s-uninstall.sh

[root@deploy ~]# which k3s-killall.sh
/usr/local/bin/k3s-killall.sh

K3s on Baremetal

https://blog.alexellis.io/bare-metal-kubernetes-with-k3s/

참고사이트

https://www.ivankrizsan.se/2020/10/31/hot-ingress-in-the-k3s-cluster/

저작자표시 비영리

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