Kubernetes中怎么集成docker
Kubernetes中怎么集成docker，针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
K8s 是一个容器集群管理系统，提供资源调度、均衡容灾、服务注册、动态扩缩容等功能。
Kubernetes组件介绍：
etcd：存储Kubernetes信息、存储各种业务容器信息等，存储flannel网络配置信息，供各节点协调。就是kubernetes的数据库，
flannel ：用于多容器之间跨主机网络通信
kube-apiserver：k8s的管理接口
kube-controller-manager：执行Kubernetes服务
kube-scheduler：容器的启动、迁移、扩容缩减调度
kubelet：对容器的实际操作者
kube-proxy ：对容器网络反向代理
准备：
1.关闭centos7的防火墙firewalld
$ systemctl stop firewalld
$ systemctl disable firewalld
2.安装NTP并确保启用和运行
$ yum -y install ntp
$ systemctl start ntpd
$ systemctl enable ntpd
配置Kubernetes Master：
在master上执行以下步骤
1.通过yum安装etcd和Kubernetes:
$ yum -y install etcd kubernetes
2.配置etcd监听/etc/etcd/etcd.conf中的所有地址：
ETCD_NAME=default
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_ADVERTISE_CLIENT_URLS="http://localhost:2379"
3.配置Kubernetes接口服务，/etc/kubernetes/apiserver
KUBE_API_ADDRESS="--address=0.0.0.0"
KUBE_API_PORT="--port=8080"
KUBELET_PORT="--kubelet_port=10250"
KUBE_ETCD_SERVERS="--etcd_servers=http://127.0.0.1:2379"
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
KUBE_ADMISSION_CONTROL="--admission_control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"
KUBE_API_ARGS=""
4.启动并启用etcd、kube-apiserver、kube- controllermanager和kube-scheduler:
$ for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do
systemctl restart $SERVICES
systemctl enable $SERVICES
systemctl status $SERVICES
done
5.在etcd中定义flannel配置
$ etcdctl mk /atomic.io/network/config '{"Network":"172.17.0.0/16"}'
6.检查节点状态，没有任何信息因为还没启动
$ kubectl get nodes
NAME LABELS STATUS
配置Kubernetes Minions节点：
以下步骤在minion1、minion2和minion3上执行
1.安装flannel和Kubernetes
$ yum -y install flannel kubernetes
2.配置用于flannel服务的etcd服务器。更新/etc/sysconfig/flanneld中的以下行连接到master服务器:
FLANNEL_ETCD="http://192.168.204.30:2379"
3.在/etc/kubernetes/config中配置Kubernetes的主服务接口
KUBE_MASTER="--master=http://192.168.204.30:8080"
4.配置/etc/kubernetes/kubelet
minion1:
KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_PORT="--port=10250"
# change the hostname to this host's IP address
KUBELET_HOSTNAME="--hostname_override=192.168.204.31"
KUBELET_API_SERVER="--api_servers=http://192.168.204.30:8080"
KUBELET_ARGS=""
minion2:
KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_PORT="--port=10250"
# change the hostname to this host's IP address
KUBELET_HOSTNAME="--hostname_override=192.168.204.32"
KUBELET_API_SERVER="--api_servers=http://192.168.204.30:8080"
KUBELET_ARGS=""
minion3:
KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_PORT="--port=10250"
# change the hostname to this host's IP address
KUBELET_HOSTNAME="--hostname_override=192.168.204.33"
KUBELET_API_SERVER="--api_servers=http://192.168.204.30:8080"
KUBELET_ARGS=""
5.启动kube-proxy、kubelet、docker和flanneld服务:
$ for SERVICES in kube-proxy kubelet docker flanneld; do
systemctl restart $SERVICES
systemctl enable $SERVICES
systemctl status $SERVICES
done
6.检查每个minion上有docker0和flannel0。在flannel0上可以获得不同范围的IP地址
minion1:
$ ip a | grep flannel | grep inet
inet 172.17.59.0/16 scope global flannel0
minion2:
$ ip a | grep flannel | grep inet
inet 172.17.19.0/16 scope global flannel0
minion3:
$ ip a | grep flannel | grep inet
inet 172.17.80.0/16 scope global flannel0
7.检查节点状态
$ kubectl get nodes
NAME STATUS AGE
192.168.204.31 Ready 8m
192.168.204.32 Ready 7m
192.168.204.33 Ready 7m
Kubernetes集群已经配置并运行了。开始配置 pods
配置 pods（Containers）
1.在Kubernetes master中定义一个yaml文件，使用kubectl命令根据定义创建pods。创建一个mysql.yaml文件:
$ mkdir pods
$ cd pods
$ vim mysql.yaml
2.添加以下几行:
apiVersion: v1
kind: Pod
metadata:
name: mysql
labels:
name: mysql
spec:
containers:
- resources:
limits :
cpu: 1
image: mysql
name: mysql
env:
- name: MYSQL_ROOT_PASSWORD
# change this
value: yourpassword
ports:
- containerPort: 3306
name: mysql
3.创建pod
$ kubectl create -f mysql.yaml
4.验证pod的创建和运行:
$ kubectl get pods
POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS CREATED
mysql 172.17.38.2 mysql mysql 192.168.204.32/192.168.204.32 name=mysql Running 3 hours
Kubernetes在192.168.204.32创建了一个Docker容器。现在需要创建一个服务，让其他pods访问已知端口和主机上的mysql数据库。
创建服务
1.在192.168.204.32里面有一个MySQL pod,定义一个 mysql-service.yaml
apiVersion: v1
kind: Service
metadata:
labels:
name: mysql
name: mysql
spec:
externalIPs:
- 192.168.204.32
ports:
# 这个端口是该服务的端口
- port: 3306
# label keys and values that must match in order to receive traffic for this service
selector:
name: mysql
2.运行服务
$ kubectl create -f mysql-service.yaml
报异常：Error from server (BadRequest): error when creating "mysql.yaml": Pod in version "v1" cannot be handled as a Pod: [pos 177]: json: expect char '"' but got char '1'
3. 查看服务，10.254.x.x是定义在/etc/kubernetes/apiserver的 Kubernetes内部IP地址，所以定义了连接到外部的网络ip:
$ kubectl get services
NAME LABELS SELECTOR IP PORT(S)
kubernetes component=apiserver,provider=kubernetes
kubernetes-ro component=apiserver,provider=kubernetes
mysql name=mysql name=mysql 10.254.13.156 3306/TCP
192.168.204.32
4.外部连接数据库
$ mysql -uroot -p -h292.168.204.32
MySQL [(none)]> show variables like '%version%';
+-------------------------+------------------------------+
| Variable_name | Value |
+-------------------------+------------------------------+
| innodb_version | 5.6.24 |
| protocol_version | 10 |
| slave_type_conversions | |
| version | 5.6.24 |
| version_comment | MySQL Community Server (GPL) |
| version_compile_machine | x86_64 |
| version_compile_os | Linux |
+-------------------------+------------------------------+
7 rows in set (0.01 sec)
关于Kubernetes中怎么集成docker问题的解答就分享到这里了，希望以上内容可以对大家有一定的帮助，如果你还有很多疑惑没有解开，可以关注行业资讯频道了解更多相关知识。
