前言
如同 Linux 操作系统安装完成后,管理员需为应用创建不同的用户,那么,K8S/OKD/Openshift集群同样也需如此,而在 OKD/Openshift 集群里,我们可集成 OpenLDAP 目录系统,方法如下所示。
OpenLDAP安装
本文使用 helm 安装 openldap,首先将chars 下载下来以方便查看:
git clone https://github.com/helm/charts
可选 。镜像可先推送到私有仓库(PS:测试发现latest 镜像有问题):
docker pull osixia/openldap:1.2.1
docker tag docker.io/osixia/openldap:1.2.1 okd-lr.zyl.io:5001/osixia/openldap:1.2.1
docker push okd-lr.zyl.io:5001/osixia/openldap:1.2.1
镜像以 root 用户运行(gosudo切换),赋权:
oc new-project auth-openshift
oc adm policy add-scc-to-user anyuid -z default
对 openldap char 参数做定制:
cd charts/stable/openldap
cp values.yaml values_cs.yaml
vi values_cs.yaml
...
env:
# LDAP 将创建 dc=zyl,dc=io 域,组织名称为 Zyl Inc.
LDAP_ORGANISATION: "Zyl Inc."
LDAP_DOMAIN: "zyl.io"
...
# Ldap 域管理员(cn=admin,dc=zyl,dc=io)及 config 管理员(cn=admin,cn=config)密码
adminPassword: admin
configPassword: config
# 持久化存储,本例使用已创建好的 glusterfs 存储系统,其支持动态提供。persistence:
enabled: true
storageClass: "glusterfs-app"
accessMode: ReadWriteOnce
size: 8Gi
执行 helm 命令安装:
helm install --name openldap -f values_cs.yaml .
Ldap启动后,创建了域 dc=zyl,dc=io 及hdb管理员账户cn=admin,dc=zyl,dc=io。如下所示,在此域下创建用户与组信息:
% oc rsh deploy/openldap
% cat > users.ldif <<EOF
dn: ou=People,dc=zyl,dc=io
ou: People
objectClass: top
objectClass: organizationalUnit
dn: ou=Group,dc=zyl,dc=io
ou: Group
objectClass: top
objectClass: organizationalUnit
dn: uid=zyl,ou=People,dc=zyl,dc=io
uid: zyl
cn: zyl
objectClass: account
objectClass: posixAccount
objectClass: top
objectClass: shadowAccount
userPassword: changeme
loginShell: /bin/bash
uidNumber: 5000
gidNumber: 5000
homeDirectory: /home/zyl
dn: uid=admin,ou=People,dc=zyl,dc=io
uid: admin
cn: admin
objectClass: account
objectClass: posixAccount
objectClass: top
objectClass: shadowAccount
userPassword: changeme
loginShell: /bin/bash
uidNumber: 5001
gidNumber: 5001
homeDirectory: /home/admin
dn: cn=zyl,ou=Group,dc=zyl,dc=io
cn: zyl
objectClass: top
objectClass: posixGroup
gidNumber: 5000
memberUid: zyl
dn: cn=admin,ou=Group,dc=zyl,dc=io
cn: admin
objectClass: top
objectClass: posixGroup
gidNumber: 5001
memberUid: admin
dn: cn=openshift_user,ou=Group,dc=zyl,dc=io
cn: openshift_user
objectClass: top
objectClass: posixGroup
gidNumber: 6000
memberUid: zyl
dn: cn=openshift_admin,ou=Group,dc=zyl,dc=io
cn: openshift_admin
objectClass: top
objectClass: posixGroup
gidNumber: 6001
memberUid: admin
EOF
% ldapadd -x -w $LDAP_ADMIN_PASSWORD -D "cn=admin,dc=zyl,dc=io" -H ldapi:/// -f users.ldif
% ldapsearch -x -D "cn=admin,dc=zyl,dc=io" -w $LDAP_ADMIN_PASSWORD \
-b dc=zyl,dc=io
# 可使用 config 管理员检查 ldap config 配置
% ldapsearch -x -D "cn=admin,cn=config" -w $LDAP_CONFIG_PASSWORD \
-b cn=config "olcDatabase=config"
配置 Master 使用 Ldap 认证
OKD初始安装时若未配置 openshift_master_identity_providers,则OKD 默认使用如下认证,此认证方式允许任何用户登录集群。
% vi /etc/origin/master/master-config.yaml
...
oauthConfig:
...
identityProviders:
- challenge: true
login: true
mappingMethod: claim
name: allow_all
provider:
apiVersion: v1
kind: AllowAllPasswordIdentityProvider
...
将所有 Master 配置的如下段删除:
- challenge: true
login: true
mappingMethod: claim
name: allow_all
provider:
apiVersion: v1
kind: AllowAllPasswordIdentityProvider
替换为如下段:
- challenge: true
login: true
mappingMethod: claim
name: ldap_auth
provider:
apiVersion: v1
attributes:
email:
- mail
id:
- dn
name:
- cn
preferredUsername:
- uid
bindDN: cn=admin,dc=zyl,dc=io
bindPassword: admin
insecure: true
kind: LDAPPasswordIdentityProvider
url: ldap://openldap.auth-openshift.svc.cluster.local./ou=People,dc=zyl,dc=io?uid
注意 :若启用TLS,即insecure: false,则需提供OpenLDAP 的证书,如添加 ca: my-ldap-ca.crt,而后将证书拷贝到Master 上:/etc/origin/master/my-ldap-ca.crt。
Ansible配置文件中的 OSEv3.yaml 加入以下段,避免升级时被还原回去。
##### Auth
openshift_master_identity_providers:
- name: ldap_auth
challenge: true
login: true
kind: LDAPPasswordIdentityProvider
bindDN: cn=admin,dc=zyl,dc=io
bindPassword: admin
url: ldap://openldap.auth-openshift.svc.cluster.local./ou=People,dc=zyl,dc=io?uid
attributes:
id: ['dn']
email: ['mail']
name: ['cn']
preferredUsername: ['uid']
insecure: true
而后分别重启 Master 节点:
master-restart api
master-restart controllers
oc get pod -n kube-system
master-logs api api # 查看日志
master-logs controllers controllers
同步 LDAP 组信息到 OKD 上
创建如下文件:
cat > rfc2307_config_user_defined.yaml <<EOF
---
kind: LDAPSyncConfig
apiVersion: v1
bindDN: cn=admin,dc=zyl,dc=io
bindPassword: admin
insecure: true
url: ldap://openldap.auth-openshift.svc.cluster.local
groupUIDNameMapping:
"cn=openshift_admin,ou=Group,dc=zyl,dc=cn": openshift_admin
"cn=openshift_user,ou=Group,dc=zyl,dc=cn": openshift_user
rfc2307:
groupsQuery:
baseDN: "ou=Group,dc=zyl,dc=io"
scope: sub
derefAliases: never
filter: (objectClass=posixGroup)
groupUIDAttribute: dn
groupNameAttributes: [cn]
groupMembershipAttributes: [memberUid]
usersQuery:
baseDN: "ou=People,dc=zyl,dc=io"
scope: sub
derefAliases: never
filter: (objectClass=posixAccount)
userUIDAttribute: uid
userNameAttributes: [cn]
EOF
执行如下命令同步:
% oc adm groups sync --sync-config=rfc2307_config_user_defined.yaml --confirm
group/zyl
group/admin
group/openshift_user
group/openshift_admin
openshift_admin作为管理员组、openshift_user为普通用户组,赋权:
oc adm policy add-cluster-role-to-group cluster-admin openshift_admin
oc adm policy add-cluster-role-to-group basic-user openshift_user
登录用户:
oc login -uadmin -pchangeme
用户登录后,OKD会生成自己的用户与 LDAP 对应:
% oc get groups
NAME USERS
admin admin
openshift_admin admin
openshift_user zyl
zyl zyl
% oc get users
NAME UID FULL NAME IDENTITIES
admin 3c4ae0bf-338c-11e9-b2f8-52540042814f admin ldap_auth:uid=admin,ou=People,dc=zyl,dc=io
% oc get identities
NAME IDP NAME IDP USER NAME USER NAME USER UID
ldap_auth:uid=admin,ou=People,dc=zyl,dc=io ldap_auth uid=admin,ou=People,dc=zyl,dc=io admin 3c4ae0bf-338c-11e9-b2f8-52540042814f
参考文档
- OpenLDAP Helm Chart:https://github.com/helm/chart…;
- osixia/openldap:https://github.com/osixia/doc…;