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kubernetes云平台管理实战： pod资源共享（三）
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一、共享容器IP地址1、查看容器进程
[root@k8s-node1 ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
27d25a2ee024 10.0.128.0:5000/nginx:latest "nginx -g 'daemon off" 6 minutes ago Up 6 minutes k8s_nginx.d9a10343_nginx_default_eb1873c6-1c70-11e9-a431-000c292bd9e1_db2f2216
5a4f3b8afc83 10.0.128.0:5000/pod-infrastructure:latest "/pod" 6 minutes ago Up 6 minutes k8s_POD.be1401e9_nginx_default_eb1873c6-1c70-11e9-a431-000c292bd9e1_e0c2e5a9
3c681264cf57 busybox "/bin/sh" About an hour ago Exited (0) 45 minutes ago sleepy_euclid
f63325fd3fff busybox "/bin/sh" 4 hours ago Exited (1) About an hour ago tiny_darwin
2、查看容器网络
[root@k8s-node1 ~]# docker inspect 5a4f3b8afc83（pod）
"NetworkSettings": {
"Bridge": "",
"SandboxID": "fd91965070d661114647c421cccdd79c72fb34d4da0d05d07a0cec7f39e0a32e",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {},
"SandboxKey": "/var/run/docker/netns/fd91965070d6",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "d553e2a5b4f2b41597a366f66768bca11fe6684d8205325f5b357be155589b8c",
"Gateway": "172.16.10.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.16.10.2",
"IPPrefixLen": 24,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:10:0a:02",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "b5808699e84fb05d664674add787aa4a9e43d3ca94739c94df244f78d0f2146f",
"EndpointID": "d553e2a5b4f2b41597a366f66768bca11fe6684d8205325f5b357be155589b8c",
"Gateway": "172.16.10.1",
"IPAddress": "172.16.10.2",
"IPPrefixLen": 24,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:10:0a:02"
}
}
}
}
]
[root@k8s-node1 ~]# docker inspect 27d25a2ee024 },
"NetworkSettings": {
"Bridge": "",
"SandboxID": "",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": null,
"SandboxKey": "",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "",
"Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "",
"IPPrefixLen": 0,
"IPv6Gateway": "",
"MacAddress": "",
"Networks": null
}
}
]
3、小结
[root@k8s-node1 ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
27d25a2ee024 10.0.128.0:5000/nginx:latest "nginx -g 'daemon off" 6 minutes ago Up 6 minutes k8s_nginx.d9a10343_nginx_default_eb1873c6-1c70-11e9-a431-000c292bd9e1_db2f2216
5a4f3b8afc83 10.0.128.0:5000/pod-infrastructure:latest "/pod" 6 minutes ago Up 6 minutes k8s_POD.be1401e9_nginx_default_eb1873c6-1c70-11e9-a431-000c292bd9e1_e0c2e5a9
3c681264cf57 busybox "/bin/sh" About an hour ago Exited (0) 45 minutes ago sleepy_euclid
f63325fd3fff busybox "/bin/sh" 4 hours ago Exited (1) About an hour ago tiny_darwin
[root@k8s-node1 ~]# docker inspect 5a4f3b8afc83（pod）
"NetworkSettings": {
"Bridge": "",
"SandboxID": "fd91965070d661114647c421cccdd79c72fb34d4da0d05d07a0cec7f39e0a32e",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {},
"SandboxKey": "/var/run/docker/netns/fd91965070d6",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "d553e2a5b4f2b41597a366f66768bca11fe6684d8205325f5b357be155589b8c",
"Gateway": "172.16.10.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.16.10.2",
"IPPrefixLen": 24,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:10:0a:02",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "b5808699e84fb05d664674add787aa4a9e43d3ca94739c94df244f78d0f2146f",
"EndpointID": "d553e2a5b4f2b41597a366f66768bca11fe6684d8205325f5b357be155589b8c",
"Gateway": "172.16.10.1",
"IPAddress": "172.16.10.2",
"IPPrefixLen": 24,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:10:0a:02"
}
}
}
}
]
[root@k8s-node1 ~]# docker inspect 27d25a2ee024 },
"NetworkSettings": {
"Bridge": "",
"SandboxID": "",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": null,
"SandboxKey": "",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "",
"Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "",
"IPPrefixLen": 0,
"IPv6Gateway": "",
"MacAddress": "",
"Networks": null
}
}
]
k8s每启动一个容器，都需要先启动一个pod容器，启动的容器共用pod容器的ip地址
二、多pod体验1、修改k8s_pod.yml文件
[root@k8s-master ~]# cat k8s_pod.yml
apiVersion: v1
kind: Pod
metadata:
name: nginx2
labels:
app: web
spec:
containers:
- name: nginx2
image: 10.0.128.0:5000/nginx:latest
ports:
- containerPort: 80
2、启动pod
[root@k8s-master ~]# kubectl create -f k8s_pod.yml
pod "nginx2" created
3、获取pod信息（简版）
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 1h
nginx2 0/1 ContainerCreating 0 18s
4、获取pod信息（详细）
[root@k8s-master ~]# kubectl describe pod nginx
Name:nginx
Namespace:default
Node:k8s-node1/10.0.128.1
Start Time:Sun, 20 Jan 2019 13:04:51 +0800
Labels:app=web
Status:Running
IP:172.16.10.2
Controllers:<none>
Containers:
nginx:
Container ID:docker://27d25a2ee0248b103991a27b81e3f244382ebdb642694e2aeb5503c373fdb912
Image:10.0.128.0:5000/nginx:latest
Image ID:docker-pullable://10.0.128.0:5000/nginx@sha256:e2847e35d4e0e2d459a7696538cbfea42ea2d3b8a1ee8329ba7e68694950afd3
Port:80/TCP
State:Running
Started:Sun, 20 Jan 2019 13:48:30 +0800
Ready:True
Restart Count:0
Volume Mounts:<none>
Environment Variables:<none>
Conditions:
TypeStatus
Initialized True
Ready True
PodScheduled True
No volumes.
QoS Class:BestEffort
Tolerations:<none>
Events:
FirstSeenLastSeenCountFromSubObjectPathTypeReasonMessage
------------------------------------------------------------
1h20m13{kubelet k8s-node1}WarningFailedSyncError syncing pod, skipping: failed to "StartContainer" for "POD" with ErrImagePull: "image pull failed for registry.access.redhat.com/rhel7/pod-infrastructure:latest, this may be because there are no credentials on this request. details: (open /etc/docker/certs.d/registry.access.redhat.com/redhat-ca.crt: no such file or directory)" 1h19m182{kubelet k8s-node1}WarningFailedSyncError syncing pod, skipping: failed to "StartContainer" for "POD" with ImagePullBackOff: "Back-off pulling image \"registry.access.redhat.com/rhel7/pod-infrastructure:latest\"" 19m19m1{kubelet k8s-node1}spec.containers{nginx}NormalPullingpulling image "10.0.128.0:5000/nginx:latest"
19m18m2{kubelet k8s-node1}WarningMissingClusterDNSkubelet does not have ClusterDNS IP configured and cannot create Pod using "ClusterFirst" policy. Falling back to DNSDefault policy.
18m18m1{kubelet k8s-node1}spec.containers{nginx}NormalPulledSuccessfully pulled image "10.0.128.0:5000/nginx:latest"
18m18m1{kubelet k8s-node1}spec.containers{nginx}NormalCreatedCreated container with docker id 27d25a2ee024; Security:[seccomp=unconfined]
18m18m1{kubelet k8s-node1}spec.containers{nginx}NormalStartedStarted container with docker id 27d25a2ee024
[root@k8s-master ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE
nginx 1/1 Running 0 1h 172.16.10.2 k8s-node1
nginx2 1/1 Running 0 52s 172.16.48.2 k8s-node2
[root@k8s-master ~]# cat k8s_pod.yml
apiVersion: v1
kind: Pod
metadata:
name: nginx2
labels:
app: web
spec:
containers:
- name: nginx2
image: 10.0.128.0:5000/nginx:latest
ports:
- containerPort: 80
[root@k8s-master ~]# kubectl create -f k8s_pod.yml
pod "nginx2" created
[root@k8s-master ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 1h
nginx2 0/1 ContainerCreating 0 18s
[root@k8s-master ~]# kubectl describe pod nginx
Name:nginx
Namespace:default
Node:k8s-node1/10.0.128.1
Start Time:Sun, 20 Jan 2019 13:04:51 +0800
Labels:app=web
Status:Running
IP:172.16.10.2
Controllers:<none>
Containers:
nginx:
Container ID:docker://27d25a2ee0248b103991a27b81e3f244382ebdb642694e2aeb5503c373fdb912
Image:10.0.128.0:5000/nginx:latest
Image ID:docker-pullable://10.0.128.0:5000/nginx@sha256:e2847e35d4e0e2d459a7696538cbfea42ea2d3b8a1ee8329ba7e68694950afd3
Port:80/TCP
State:Running
Started:Sun, 20 Jan 2019 13:48:30 +0800
Ready:True
Restart Count:0
Volume Mounts:<none>
Environment Variables:<none>
Conditions:
TypeStatus
Initialized True
Ready True
PodScheduled True
No volumes.
QoS Class:BestEffort
Tolerations:<none>
Events:
FirstSeenLastSeenCountFromSubObjectPathTypeReasonMessage
------------------------------------------------------------
1h20m13{kubelet k8s-node1}WarningFailedSyncError syncing pod, skipping: failed to "StartContainer" for "POD" with ErrImagePull: "image pull failed for registry.access.redhat.com/rhel7/pod-infrastructure:latest, this may be because there are no credentials on this request. details: (open /etc/docker/certs.d/registry.access.redhat.com/redhat-ca.crt: no such file or directory)" 1h19m182{kubelet k8s-node1}WarningFailedSyncError syncing pod, skipping: failed to "StartContainer" for "POD" with ImagePullBackOff: "Back-off pulling image \"registry.access.redhat.com/rhel7/pod-infrastructure:latest\"" 19m19m1{kubelet k8s-node1}spec.containers{nginx}NormalPullingpulling image "10.0.128.0:5000/nginx:latest"
19m18m2{kubelet k8s-node1}WarningMissingClusterDNSkubelet does not have ClusterDNS IP configured and cannot create Pod using "ClusterFirst" policy. Falling back to DNSDefault policy.
18m18m1{kubelet k8s-node1}spec.containers{nginx}NormalPulledSuccessfully pulled image "10.0.128.0:5000/nginx:latest"
18m18m1{kubelet k8s-node1}spec.containers{nginx}NormalCreatedCreated container with docker id 27d25a2ee024; Security:[seccomp=unconfined]
18m18m1{kubelet k8s-node1}spec.containers{nginx}NormalStartedStarted container with docker id 27d25a2ee024
[root@k8s-master ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE
nginx 1/1 Running 0 1h 172.16.10.2 k8s-node1
nginx2 1/1 Running 0 52s 172.16.48.2 k8s-node2
