7 部署apiserver
下载k8s的包
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部署apiserver的节点为node2 node3
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下载kubernetes包,进入kubernetes的github页面:
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进入tags页签:https://github.com/kubernetes/kubernetes/tags
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选择要下载的版本:https://github.com/kubernetes/kubernetes/releases/tag/v1.16.13
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点击 CHANGELOG-xxx.md 进入说明页面,往下找对应版本的Server binaries:
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下载Server Binaries:
https://dl.k8s.io/v1.16.10/kubernetes-server-linux-amd64.tar.gz
解压k8s包
[root@node3 bin]# tar xf kubernetes-server-linux-amd64.tar.gz
[root@node3 bin]# mv kubernetes kubernetes-v1.15.11
[root@node3 bin]# ln -s /opt/src/kubernetes-v1.15.11/ /opt/kubernetes
[root@node3 bin]# cd /opt/kubernetes/server/bin
[root@node3 bin]# rm -rf *.tar *_tag
6.4 签发证书
- 签发证书使用node5节点
- 签发client证书,apiserver和etcd通信用的证书
[root@node5 certs]# cd /opt/certs/
[root@node5 certs]# vim /opt/certs/client-csr.json
{
"CN": "k8s-node",
"hosts": [
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "beijing",
"L": "beijing",
"O": "od",
"OU": "ops"
}
]
}
[root@node5 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=client client-csr.json |cfssl-json -bare client
2020/01/06 13:42:47 [INFO] generate received request
2020/01/06 13:42:47 [INFO] received CSR
2020/01/06 13:42:47 [INFO] generating key: rsa-2048
2020/01/06 13:42:47 [INFO] encoded CSR
2020/01/06 13:42:47 [INFO] signed certificate with serial number 268276380983442021656020268926931973684313260543
2020/01/06 13:42:47 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@node5 certs]# ls client* -l
-rw-r--r-- 1 root root 993 Jan 6 13:42 client.csr
-rw-r--r-- 1 root root 280 Jan 6 13:42 client-csr.json
-rw------- 1 root root 1679 Jan 6 13:42 client-key.pem
-rw-r--r-- 1 root root 1363 Jan 6 13:42 client.pem
- 签发server证书,apiserver和其他k8s组件通信使用的证书,hosts中将所有可能作为apiserver的ip添加进去,VIP 也要加入
[root@node5 certs]# vim /opt/certs/apiserver-csr.json
{
"CN": "k8s-apiserver",
"hosts": [
"127.0.0.1",
"192.168.0.1",
"kubernetes.default",
"kubernetes.default.svc",
"kubernetes.default.svc.cluster",
"kubernetes.default.svc.cluster.local",
"172.16.6.180",
"172.16.6.181",
"172.16.6.182",
"172.16.6.183",
"172.16.6.184"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "beijing",
"L": "beijing",
"O": "od",
"OU": "ops"
]
}
[root@node5 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server apiserver-csr.json |cfssl-json -bare apiserver
2020/01/06 13:46:56 [INFO] generate received request
2020/01/06 13:46:56 [INFO] received CSR
2020/01/06 13:46:56 [INFO] generating key: rsa-2048
2020/01/06 13:46:56 [INFO] encoded CSR
2020/01/06 13:46:56 [INFO] signed certificate with serial number 573076691386375893093727554861295529219004473872
2020/01/06 13:46:56 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@node5 certs]# ls apiserver* -l
-rw-r--r-- 1 root root 1249 Jan 6 13:46 apiserver.csr
-rw-r--r-- 1 root root 566 Jan 6 13:45 apiserver-csr.json
-rw------- 1 root root 1675 Jan 6 13:46 apiserver-key.pem
-rw-r--r-- 1 root root 1598 Jan 6 13:46 apiserver.pem
- 证书下发到需要安装apiserver服务的节点。
- 在需要安装apiserver的节点创建certs目录
mkdir /opt/kubernetes/server/bin/certs
- 在签发证书节点将刚才签发的client证书和server证书下发:
scp apiserver-key.pem apiserver.pem ca-key.pem ca.pem client-key.pem client.pem node2:/opt/kubernetes/server/bin/certs/
6.5 配置apiserver的日志审计
[root@node3 conf]# cat audit.yaml
apiVersion: audit.k8s.io/v1beta1 # This is required.
kind: Policy
# Don't generate audit events for all requests in RequestReceived stage.
omitStages:
- "RequestReceived"
rules:
# Log pod changes at RequestResponse level
- level: RequestResponse
resources:
- group: ""
# Resource "pods" doesn't match requests to any subresource of pods,
# which is consistent with the RBAC policy.
resources: ["pods"]
# Log "pods/log", "pods/status" at Metadata level
- level: Metadata
resources:
- group: ""
resources: ["pods/log", "pods/status"]
# Don't log requests to a configmap called "controller-leader"
- level: None
resources:
- group: ""
resources: ["configmaps"]
resourceNames: ["controller-leader"]
# Don't log watch requests by the "system:kube-proxy" on endpoints or services
- level: None
users: ["system:kube-proxy"]
verbs: ["watch"]
resources:
- group: "" # core API group
resources: ["endpoints", "services"]
# Don't log authenticated requests to certain non-resource URL paths.
- level: None
userGroups: ["system:authenticated"]
nonResourceURLs:
- "/api*" # Wildcard matching.
- "/version"
# Log the request body of configmap changes in kube-system.
- level: Request
resources:
- group: "" # core API group
resources: ["configmaps"]
# This rule only applies to resources in the "kube-system" namespace.
# The empty string "" can be used to select non-namespaced resources.
namespaces: ["kube-system"]
# Log configmap and secret changes in all other namespaces at the Metadata level.
- level: Metadata
resources:
- group: "" # core API group
resources: ["secrets", "configmaps"]
# Log all other resources in core and extensions at the Request level.
- level: Request
resources:
- group: "" # core API group
- group: "extensions" # Version of group should NOT be included.
# A catch-all rule to log all other requests at the Metadata level.
- level: Metadata
# Long-running requests like watches that fall under this rule will not
# generate an audit event in RequestReceived.
omitStages:
- "RequestReceived"
配置apiserver的启动脚本
- apiserver启动脚本
[root@node3 conf]# cat /opt/kubernetes/server/bin/kube-apiserver-startup.sh
#!/bin/bash
WORK_DIR=$(dirname $(readlink -f $0))
[ $? -eq 0 ] && cd $WORK_DIR || exit
/opt/kubernetes/server/bin/kube-apiserver \
--apiserver-count 2 \
--audit-log-path /data/logs/kubernetes/kube-apiserver/audit-log \
--audit-policy-file ./conf/audit.yaml \
--authorization-mode RBAC \
--client-ca-file ./certs/ca.pem \
--requestheader-client-ca-file ./certs/ca.pem \
--enable-admission-plugins NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota \
--etcd-cafile ./certs/ca.pem \
--etcd-certfile ./certs/client.pem \
--etcd-keyfile ./certs/client-key.pem \
--etcd-servers https://172.16.6.182:2379,https://172.16.6.183:2379,https://172.16.6.184:2379 \
--service-account-key-file ./certs/ca-key.pem \
--service-cluster-ip-range 192.168.0.0/16 \
--service-node-port-range 3000-29999 \
--target-ram-mb=1024 \
--kubelet-client-certificate ./certs/client.pem \
--kubelet-client-key ./certs/client-key.pem \
--log-dir /data/logs/kubernetes/kube-apiserver \
--tls-cert-file ./certs/apiserver.pem \
--tls-private-key-file ./certs/apiserver-key.pem \
--v 2
chmod +x /opt/kubernetes/serever/bin/kube-apiserver-startup.sh
- 创建日志目录
mkdir /data/logs/kubernetes/kube-apiserver/audit-log
配置supervisor启动配置
[root@node3 conf]# cat /etc/supervisord.d/kube-apiserver.ini
[program:kube-apiserver-node2]
command=/opt/kubernetes/server/bin/kube-apiserver-startup.sh
numprocs=1
directory=/opt/kubernetes/server/bin
autostart=true
autorestart=true
startsecs=30
startretries=3
exitcodes=0,2
stopsignal=QUIT
stopwaitsecs=10
user=root
redirect_stderr=true
stdout_logfile=/data/logs/kubernetes/kube-apiserver/apiserver.stdout.log
stdout_logfile_maxbytes=64MB
stdout_logfile_backups=5
stdout_capture_maxbytes=1MB
stdout_events_enabled=false
[root@node2 bin]# supervisorctl update
[root@node2 bin]# supervisorctl status
etcd-server-node2 RUNNING pid 23637, uptime 22:26:08
kube-apiserver-node2 RUNNING pid 32591, uptime 0:05:37
启停apiserver
[root@node2 bin]# supervisorctl start kube-apiserver-node2
[root@node2 bin]# supervisorctl stop kube-apiserver-node2
[root@node2 bin]# supervisorctl restart kube-apiserver-node2
[root@node2 bin]# supervisorctl status kube-apiserver-node2
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