1、基本概念
为了方便管理和集成jenkins，k8s、harbor、jenkins均使用openLDAP统一认证。
2、部署openLDAP
根据之前的文档，openLDAP使用GFS进行数据持久化。
下载对应的openLDAP文件
git clone https://github.com/dotbalo/k8s.git cd k8s/openldap
创建openLDAP
[[email protected] openldap]# kubectl apply -f . deployment.extensions/ldap created persistentvolumeclaim/openldap-data created secret/ldap-secret created service/ldap-service created deployment.extensions/phpldapadmin created service/phpldapadmin created
此处参考的是：https://github.com/osixia/docker-openldap，更新DN可以更改environment下的yaml文件，默认的example.org
创建ldap-ui-ingress
[[email protected] traefik]# kubectl create -f traefik-ldap.yaml
ingress.extensions/ldap-ui created
[[email protected]-master01 traefik]# cat traefik-ldap.yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: ldap-ui
namespace: public-service
annotations:
kubernetes.io/ingress.class: traefik
spec:
rules:
- host: ldap.xxx.net
http:
paths:
- backend:
serviceName: phpldapadmin
servicePort: 8080
3、查看验证
[[email protected] openldap]# kubectl get po,svc,pvc -n public-service | grep ldap pod/ldap-944645448-pqj8b 1/1 Running 0 4m pod/phpldapadmin-6c99c76cb6-knmpf 1/1 Running 0 4m service/glusterfs-dynamic-openldap-data ClusterIP 10.111.198.83 <none> 1/TCP 3m service/ldap-service ClusterIP 10.98.153.44 <none> 389/TCP,636/TCP 4m service/phpldapadmin ClusterIP 10.109.141.207 <none> 8080/TCP 4m persistentvolumeclaim/openldap-data Bound pvc-f251128b-ec17-11e8-8a89-000c293ad492 1Gi RWX gluster-heketi 4m
访问phpldapadmin：ldap.xxx.net
默认DN：cn=admin,dc=example,dc=org，默认Password：admin(线上系统需自定义修改)
登录成功如下：
5、添加用户和组
创建Groups和People OU
相同方式创建Groups
创建组和用户
相同方式创建测试组，devops组
创建用户
填写基本信息，选择组和Login Shell
注意修改Common Name
为每个用户添加Email，没有Email无法登陆gitlab
6、配置k8s使用ldap登录
修改openldap/k8s-ldap的nginx配置，server为k8s dashboard的地址
制作镜像
[[email protected] k8s-ldap]# docker build -t dotbalo/k8s-nginx-ldap .
Sending build context to Docker daemon 22.02 kB
Step 1/10 : FROM python:2-alpine
---> f901fc789b69
Step 2/10 : COPY nginx-ldap-auth-daemon.py /usr/src/app/
---> Using cache
---> 2c09e174dc92
Step 3/10 : WORKDIR /usr/src/app/
---> Using cache
---> 80b2344aff04
Step 4/10 : RUN apk --no-cache add openldap-dev && apk --no-cache add --virtual build-dependencies build-base && pip install python-ldap && apk del build-dependencies
---> Using cache
---> 562bd91f40e4
Step 5/10 : ENV NGINX_VERSION 1.14.1
---> Using cache
---> ebeed109cb40
Step 6/10 : RUN set -x && mkdir -p /tmp/src/nginx /usr/lib/nginx/modules /var/cache/nginx && apk add --no-cache --virtual .build-deps curl gcc gd-dev geoip-dev gnupg libc-dev libxslt-dev linux-headers make openldap-dev pcre-dev tar unzip zlib-dev && curl -fsSL http://nginx.org/download/nginx-${NGINX_VERSION}.tar.gz | tar vxz --strip=1 -C /tmp/src/nginx && curl -fsSL https://github.com/kvspb/nginx-auth-ldap/archive/master.zip -o /tmp/nginx-auth-ldap-master.zip && unzip -d /tmp/src /tmp/nginx-auth-ldap-master.zip && cd /tmp/src/nginx && addgroup -S nginx && adduser -D -S -h /var/cache/nginx -s /sbin/nologin -G nginx nginx && ./configure --prefix=/usr/share/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-http_ssl_module --with-http_realip_module --with-http_addition_module --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_random_index_module --with-http_secure_link_module --with-http_stub_status_module --with-http_auth_request_module --with-http_xslt_module=dynamic --with-http_image_filter_module=dynamic --with-http_geoip_module=dynamic --with-threads --with-stream --with-stream_ssl_module --with-stream_ssl_preread_module --with-stream_realip_module --with-stream_geoip_module=dynamic --with-http_slice_module --with-mail --with-mail_ssl_module --with-compat --with-file-aio --with-http_v2_module --add-module=/tmp/src/nginx-auth-ldap-master && make -j$(getconf _NPROCESSORS_ONLN) && make install && mkdir -vp /etc/nginx/conf.d/ /usr/share/nginx/html/ && install -m644 html/index.html /usr/share/nginx/html/ && install -m644 html/50x.html /usr/share/nginx/html/ && ln -sf /dev/stdout /var/log/nginx/access.log && ln -sf /dev/stderr /var/log/nginx/error.log && apk add --no-cache --virtual .gettext gettext && mv /usr/bin/envsubst /tmp/ && runDeps="$( scanelf --needed --nobanner /usr/sbin/nginx /usr/lib/nginx/modules/*.so /tmp/envsubst | awk ‘{ gsub(/,/, "\nso:", $2); print "so:" $2 }‘ | sort -u | xargs -r apk info --installed | sort -u )" && apk add --no-cache --virtual .nginx-rundeps $runDeps && apk del .build-deps && apk del .gettext && rm -fr /etc/nginx/*.default /tmp/* /var/tmp/* /var/cache/apk/*
---> Using cache
---> 3283f6c81d18
Step 7/10 : COPY start.sh /bin/
---> Using cache
---> c2204e898bb8
Step 8/10 : COPY nginx.conf /etc/nginx/
---> d99a904b384d
Removing intermediate container 5f086340c1e5
Step 9/10 : EXPOSE 8888
---> Running in 1b52b272eeda
---> 72825fcd8ea5
Removing intermediate container 1b52b272eeda
Step 10/10 : EXPOSE 8081
---> Running in fdce8ba84145
---> f4f3866e01b1
Removing intermediate container fdce8ba84145
Successfully built f4f3866e01b1
修改k8s-ldap的ldap-deployment.yaml镜像名称
[[email protected] k8s-ldap]# kubectl create -f ldap-deployment.yaml [[email protected]-master01 k8s-ldap]# kubectl get po,svc -n public-service | grep k8s-nginx pod/k8s-nginx-ldap-5c5bf9595d-8pqw2 1/1 Running 0 4m service/k8s-nginx-ldap NodePort 10.100.70.192 <none> 8081:31486/TCP 14m [[email protected]-master01 k8s-ldap]#
访问：IP:NODEPORT
输入刚才创建的账号密码，注意此时是没有权限的
官网的解释如下
貌似所有的请求头都被清空，都变成了system:serviceaccount:kube-system:kubernetes-dashboard这个用户
7、授权访问
在k8s安装后，会自动创建一个有全局读权限的clusterrole：view，将此权限授权给system:serviceaccount:kube-system:kubernetes-dashboard用户
[[email protected] k8s-ldap]# kubectl create -f k8s-ldap-user-crb.yaml clusterrolebinding.rbac.authorization.k8s.io/k8s-ldap-user created
创建完成后刷新dashboard，可以看到有了只读权限(secret和role没有权限)
8、总结
1） 与容器云相比，容器云的权限控制更为完善，可是实现基于用户的验证，可以区分openLDAP中不同的用户不同的权限，而k8s被统一成了kubernetes-dashboard这个用户，也有可能是自己没有配置成功，后期需要再次确认。
2） 可以限制openLDAP中的用户只访问某些namespace，需要自行定义权限。
3） 公司没有需要无需让非ops员工访问k8s。
参考：
https://github.com/osixia/
https://icicimov.github.io/blog/virtualization/Kubernetes-LDAP-Authentication/
https://github.com/nginxinc/nginx-ldap-auth.git
原文地址：https://www.cnblogs.com/dukuan/p/9983899.html
时间： 2024-11-08 23:08:55