RHCE习题

2022-12-11,

RHCE习题

考试说明:

RH294系统信息

在练习期间,您将操作下列虚拟系统:

真实机: foundation:

kiosk:redhat

root: Asimov

workstation.lab.example.com 172.25.250.9 Ansible control node

servera.lab.example.com 172.25.250.10 Ansible managed node

serverb.lab.example.com 172.25.250.11 Ansible managed node

serverc.lab.example.com 172.25.250.12 Ansible managed node

serverd.lab.example.com 172.25.250.13 Ansible managed node

bastion.lab.example.com 172.25.250.254 Ansible managed node

workstation为ansible节点

servera、serverb、serverc、serverd、bastion为受控主机

已经全部配置好ssh的基于密钥认证

Ansible 控制节点上已创建了用户帐户 student。此帐户预装了 SSH密钥,

允许在 Ansible 控制节点和各个 Ansible 受管节点之间进行SSH 登录。

请勿对系统上的 student SSH 配置文件进行任何修改。

您可以从 root 帐户使用 su 访问此用户帐户

二、前提环境准备

1、

[kiosk@foundation ~]$ virt-manager
[kiosk@foundation ~]$ rht-vmctl reset all
输入y确认重置所有主机
[kiosk@foundation ~]$ ssh -X root@workstation
[root@workstation ~]# dnf install -y ansible
[root@workstation ~]# vim /etc/sudoers.d/student
student ALL=(ALL) NOPASSWD: ALL
[root@workstation ~]# for i in server{a..d} bastion
> do scp /etc/sudoers.d/student root@$i:/etc/sudoers.d/
> done

2、更改workstation、servera、serverb、serverc、serverd、bastion

主机的/etc/hosts文件,把文件中content.example.com对应的ip改为172.25.254.250

[root@workstation ~]# for i in server{a..d} bastion
> do scp /etc/hosts root@$i:/etc/hosts
> done

3、使用xshell将考试环境需要的那些文件都上传到/content/目录下

4、关闭bastion的httpd服务

ssh  root@bastion
systemctl stop httpd
systemctl disable httpd

正式答题1、安装和配置Ansible

按照下方所述,在控制节点workstation.lab.example.com 上安装和配置Ansible:

安装所需的软件包

创建名为/home/student/ansible/inventory的静态清单文件, 以满足以下需求:

servera是dev主机组的成员

serverb是test主机组的成员

serverc和serverd是prod主机组的成员

bastion是balancers主机组的成员

prod组是webservers主机组的成员

创建名为/home/student/ansible/ansible.cfg的配置文件, 以满足以下要求:

主机清单文件为/home/student/ansible/inventory

playbook中使用的角色的位置包括/home/student/ansible/roles

解答:

[student@workstation ~]$ mkdir ansible
[student@workstation ~]$ cd ansible
[student@workstation ansible]$ cp /etc/ansible/ansible.cfg /home/student/ansible/
[student@workstation ansible]$ mkdir /home/student/ansible/roles
[student@workstation ansible]$ vi ansible.cfg
[defaults]
inventory = /home/student/ansible/inventory
remote_user = student
roles_path = /home/student/ansible/roles
host_key_checking = false
[privilege_escalation]
become = true
become_method = sudo
become_user = root
become_ask_pass = false
[student@workstation ansible]$ vim inventory
[dev]
servera
[test]
serverb
[prod]
serverc
serverd
[balancers]
bastion
[webservers:children]
prod 验证:
[student@workstation ansible]$ ansible all -m ping

2、创建和运行Ansible临时命令

作为系统管理员, 您需要在受管节点上安装软件.

请按照下方所述, 创建一个名为/home/student/ansible/adhoc.sh的shell脚本,

该脚本将使用Ansible临时命令在各个受管节点上安装yum存储库:

存储库1:

存储库的名称为 rh294_BASE

描述为 rh294 base software

基础URL为 http://content.example.com/rhel8.0/x86_64/dvd/BaseOS

GPG签名检查为启用状态

GPG密钥URL为 http://content.example.com/rhel8.0/x86_64/dvd/RPM-GPG-KEY-redhat-release

存储库为开启状态

存储库2:

存储库的名称为 rh294_STREAM

描述为 rh294 stream software

基础URL为 http://content.example.com/rhel8.0/x86_64/dvd/AppStream

GPG签名检查为启用状态

GPG密钥URL为 http://content.example.com/rhel8.0/x86_64/dvd/RPM-GPG-KEY-redhat-release

存储库为开启状态

解答:

[student@workstation ansible]$ vim adhoc.sh
#!/bin/bash
ansible all -m yum_repository -a "name=rh294_BASE description='rh294 base software'
file=rhel_dvd baseurl=http://content.example.com/rhel8.0/x86_64/dvd/BaseOS gpgcheck=yes
gpgkey=http://content.example.com/rhel8.0/x86_64/dvd/RPM-GPG-KEY-redhat-release enabled=yes" ansible all -m yum_repository -a "name=rh294_STREAM description='rh294 stream software'
file=rhel_dvd baseurl=http://content.example.com/rhel8.0/x86_64/dvd/AppStream
gpgcheck=yes gpgkey=http://content.example.com/rhel8.0/x86_64/dvd/RPM-GPG-KEY-redhat-release enabled=yes" [student@workstation ansible]$ chmod +x adhoc.sh
[student@workstation ansible]$ ./adhoc.sh

3、安装软件包

创建一个名为 /home/student/ansible/packages.yml的 playbook:

将 php 和 mariadb 软件包安装到 dev、test 和 prod 主机组中的主机上

将 RPM Development Tools 软件包组安装到 dev主机组中的主机上

将 dev 主机组中主机上的所有软件包更新为最新版本

解答:

[student@workstation ansible]$ vim packages.yml
---
- name: install pkgs
hosts: dev, test, prod
tasks:
- name: install mariadb php
yum:
name:
- php
- mariadb
state: present
- name: install group pkgs
hosts: dev
tasks:
- name: install Development Tools
yum:
name: "@Development Tools"
state: present
- name: update all pkgs
hosts: dev
tasks:
- name: update pkgs
yum:
name: '*'
state: latest
[student@workstation ansible]$ ansible-playbook packages.yml

4、使用RHEL系统角色

安装 RHEL 系统角色软件包,并创建符合以下条件的playbook /home/student/ansible/timesync.yml:

在所有受管节点上运行

使用 timesync 角色

配置该角色,以使用当前有效的 NTP 提供商

配置该角色,以使用时间服务器 classroom.example.com

配置该角色,以启用 iburst 参数

解答:

[student@workstation ansible]$ sudo yum -y install rhel-system-roles
[student@workstation ansible]$ mkdir roles
[student@workstation ansible]$ cp -r /usr/share/ansible/roles/rhel-system-roles.timesync/ /home/student/ansible/roles/timesync
[student@workstation ansible]$ vim timesync.yml
---
- name: set time sync
hosts: all
vars:
timesync_ntp_servers:
- hostname: classroom.example.com
iburst: yes
roles:
- timesync
[student@workstation ansible]$ ansible-playbook timesync.yml 使用selinux角色
配置该角色,开启所有受控节点的selinux
[student@workstation ansible]$ cp -r /usr/share/ansible/roles/rhel-system-roles.selinux /home/student/ansible/roles/selinux vim selinux.yml
---
- name: set selinux
hosts: all
vars:
selinux_state: enforcing
roles:
- role: selinux
become: true [student@workstation ansible]$ ansible-playbook selinux.yml

5、使用Ansible Galaxy安装角色

使用 Ansible Galaxy 和要求文件 /home/student/ansible/roles/requirements.yml,从以下 URL 下载角色并安装到 /home/student/ansible/roles:

http://content.example.com/haproxy.tar.gz 此角色的名称应当为 balancer

http://content.example.com/phpinfo.tar.gz 此角色的名称应当为 phpinfo

解答:

[student@workstation ansible]$ vim roles/requirements.yml
---
- name: balancer
src: http://content.example.com/ansible2.8/haproxy.tar.gz
- name: phpinfo
src: http://content.example.com/ansible2.8/phpinfo.tar.gz
[student@workstation ansible]$ ansible-galaxy install -r /home/student/asnible/roles/requirements.yml -p /home/student/ansible/roles/

6、创建和使用角色

根据下列要求,在/home/student/ansible/roles中创建名为apache的角色:

httpd软件包已安装,设为在系统启动时启用并启动

防火墙已启用并正在运行,并使用允许访问Web服务器的规则

模板文件 index.html.j2 已存在,用于创建具有以下输出的文件/var/www/html/index.html:

Welcome to HOSTNAME on IPADDRESS

其中,HOSTNAME是受管节点的完全限定域名,IPADDRESS则是受管节点的IP地址。

按照下方所述,创建一个使用此角色的playbook /home/student/ansible/newrole.yml:

该playbook在webservers主机组中的主机上运行

解答:

[student@workstation ansible]$ cd roles/
[student@workstation roles]$ ansible-galaxy init apache
[student@workstation roles]$ vim http/tasks/main.yml
---
# tasks file for http
- name: install httpd firewalld
yum:
name:
- httpd
- firewalld
state: present - name: cp file
template:
src: index.html.j2
dest: /var/www/html/index.html - name: start httpd
service:
name: httpd
state: started
enabled: yes - name: restart firewalld
service:
name: firewalld
state: restarted
enabled: yes - name: firewalld for http
firewalld:
service: http
state: enabled
permanent: yes
immediate: yes [student@workstation roles]$ vim http/templates/index.html.j2
Welcome to {{ansible_fqdn}} on {{ansible_enp1s0.ipv4.address}} [student@workstation ansible]$ vim newrole.yml
---
- name: use http role
hosts: webservers
roles:
- apache
[student@workstation ansible]$ ansible-playbook newrole.yml 验证结果:
[student@workstation ansible]$ curl http://serverc
Welcome to serverc.lab.example.com on 172.25.250.12
[student@workstation ansible]$ curl http://serverd
Welcome to serverd.lab.example.com on 172.25.250.13

7、从Ansible Galaxy使用角色

根据下列要求,创建一个名为 /home/student/ansible/roles.yml的playbook:

playbook中包含一个play,该play在balancers主机组中的主机上运行并将使用balancer角色。

此角色配置一项服务,以在webservers主机组中的主机之间平衡Web服务器请求的负载。

浏览到balancers主机组中的主机(例如http://bastion.lab.example.com/ )将生成以下输出:

Welcome to serverc.example.com on 172.25.1.12

重新加载浏览器将从另一Web服务器生成输出:

Welcome to serverd.example.com on 172.25.1.13

playbook 中包含一个 play,该 play 在 webservers主机组中的主机上运行并将使用 phpinfo 角色。

通过 URL /hello.php 浏览到 webservers 主机组中的主机将生成以下输出:

Hello PHP World from FQDN

其中,FQDN是主机的完全限定名称。

例如,浏览到 http://serverc.lab.example.com/hello.php 会生成以下输出:

Hello PHP World from serverc.lab.example.com

另外还有 PHP 配置的各种详细信息,如安装的PHP 版本等。

同样,浏览到 http://serverd.lab.example.com/hello.php 会生成以下输出:

Hello PHP World from serverd.lab.example.com

另外还有 PHP 配置的各种详细信息,如安装的PHP 版本等。

解答:

[student@workstation ansible]$ vim roles.yml
---
- name: gather facts for webservers
hosts: webservers //获取webservers的事实变量,因为你要在webservers主机组上平衡WEB服务器的负载。 - name: balancer role
hosts: balancers
roles:
- balancer - name: php role
hosts: webservers
roles:
- phpinfo 再来执行该playbook
[student@workstation ansible]$ ansible-playbook roles.yml 验证:
[student@workstation ansible]$ curl http://bastion.lab.example.com
Welcome to serverc.lab.example.com on 172.25.250.12
[student@workstation ansible]$ curl http://bastion.lab.example.com
Welcome to serverd.lab.example.com on 172.25.250.13 [student@workstation ansible]$ curl http://serverc.lab.example.com/hello.php
Hello PHP World form serverc.lab.example.com
[student@workstation ansible]$ curl http://serverd.lab.example.com/hello.php
Hello PHP World form serverd.lab.example.com

8、创建和使用逻辑卷

创建一个名为/home/student/ansible/lv.yml 的playbook,它将在所有受管节点上运行以执行下列任务:

创建符合以下要求的逻辑卷:

逻辑卷创建在research卷组中

逻辑卷名称为data

逻辑卷大小为1500MiB

使用ext4文件系统格式化逻辑卷

如果无法创建请求的逻辑卷大小,应显示错误消息

Could not create logical volume of that size,并且应改为使用大小 800MiB。

如果卷组research 不存在 ,应显示错误消息

Volume group does not exist。

不要以任何方式挂载逻辑卷

前期环境

首先执行lvm_pre.yml

[student@workstation ansible]$ ansible-playbook lvm_pre.yml

答题:

[student@workstation ansible]$ vim lv.yml

---
- name: create lvm
hosts: all
tasks:
- name: create lv data
block:
- name: create lv 1500M
lvol:
lv: data
vg: research
size: 1500M
rescue:
- name: output fail message
debug:
msg: Could not create logical volume of that size - name: create lv 800M
lvol:
lv: data
vg: research
size: 800M always:
- name: format lv
filesystem:
dev: /dev/research/data
fstype: ext4
when: "'research' in ansible_lvm.vgs" - name: search not exists
debug:
msg: Volume group does not exist
when: "'research' not in ansible_lvm.vgs" [student@workstation ansible]$ ansible-playbook lv.yml

创建和使用分区

创建名为partition.yml的playbook,对所有节点进行操作:

在vdb上创建一个主分区1500MiB

使用ext4文件系统进行格式化

将文件系统挂载到/newpart

如果分区大小不满足,产生报错信息 could not create partition os that size

则创建分区大小变成800MiB

如果磁盘不存在,产生报错信息:disk does not exist

[student@workstation ansible]$ vim partition.yml
---
- name: create partition
hosts: all
tasks:
- name: create part1
block:
- name: create part 1500
parted:
device: /dev/vdb
number: 1
part_type: primary
part_start: 10MiB
part_end: 1510MiB
state: present rescue:
- name: output fail message
debug:
msg: could not create partition os that size - name: create part 800
parted:
device: /dev/vdb
number: 1
part_type: primary
part_start: 10MiB
part_end: 800MiB
state: present always:
- name: format part
filesystem:
dev: /dev/vdb1
fstype: ext4 - name: create mount point
file:
path: /newpart
state: directory - name: mount
mount:
src: /dev/vdb1
path: /newpart
fstype: ext4
state: mounted
when: "ansible_devices.vdb is defined" - name: vdb not exist
debug:
msg: disk does not exist
when: "ansible_devices.vdb is not defined" [student@workstation ansible]$ ansible-playbook partition.yml
由于练习环境原因,此playbook无法正常运行。

9、生成主机文件

将一个初始模板文件从http://content.example.com/hosts.j2下载到/home/student/ansible

完成该模板,以便用它生成以下文件:针对每个清单主机包含一行内容,其格式与 /etc/hosts 相同

创建名为 /home/student/ansible/hosts.yml 的playbook,它将使用此模板在 dev 主机组中的主机上生成文件 /etc/myhosts。

该 playbook 运行后,dev 主机组中主机上的文件/etc/myhosts 应针对每个受管主机包含一行内容:

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4

::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

172.24.1.6 servera.lab1.example.com servera

172.24.1.7 serverb.lab1.example.com serverb

172.24.1.8 serverc.lab1.example.com serverc

172.24.1.9 serverd.lab1.example.com serverd

172.24.1.10 bastion.lab1.example.com bastion

解答:

[student@workstation ansible]$ wget http://content.example.com/hosts.j2

[student@workstation ansible]$ vim hosts.j2

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4

::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

{% for host in groups.all %}

{{ hostvars[host].ansible_enp1s0.ipv4.address }} {{ hostvars[host].ansible_fqdn }} {{ hostvars[host].ansible_hostname }}

{% endfor %}

[student@workstation ansible]$ vim hosts.yml


name: get all facts

hosts: all
name: cp to myhosts

hosts: dev

tasks:

name: cp file

template:

src: /home/student/ansible/hosts.j2

dest: /etc/myhosts

验证:

[root@servera ~]# cat /etc/myhosts

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4

::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

172.25.250.10 servera.lab.example.com servera

172.25.250.11 serverb.lab.example.com serverb

172.25.250.254 bastion.lab.example.com bastion

172.25.250.12 serverc.lab.example.com serverc

172.25.250.13 serverd.lab.example.com serverd

10、修改文件内容

按照下方所述,创建一个名为 /home/student/ansible/issue.yml 的 playbook:

该 playbook 将在所有清单主机上运行

该 playbook 会将 /etc/issue 的内容替换为下方所示的一行文本:

在 dev 主机组中的主机上,这行文本显示为:Development

在 test 主机组中的主机上,这行文本显示为:Test

在 prod 主机组中的主机上,这行文本显示为:Production

解答:

[student@workstation ansible]$ vim issue.yml

---
- name: modify issue
hosts: all
tasks:
- name: input to issue
copy:
content: |
{% if 'dev' in group_names %}
Development
{% elif 'test' in group_names %}
Test
{% elif 'prod' in group_names %}
Production
{% endif %}
dest: /etc/issue [student@workstation ansible]$ ansible-playbook issue.yml 验证:
[root@servera ~]# cat /etc/issue
Development [root@serverb ~]# cat /etc/issue
Test [root@serverc ~]# cat /etc/issue
Production [root@serverd ~]# cat /etc/issue
Production

11、创建Web内容目录

按照下方所述,创建一个名为 /home/student/ansible/webcontent.yml 的 playbook:

该 playbook 在 dev 主机组中的受管节点上运行

创建符合下列要求的目录 /webdev:

所有者为 devops 组

具有常规权限:owner=read+write+execute,group=read+write+execute,other=read+execute

具有特殊权限: set group ID

用符号链接将 /var/www/html/webdev 链接到 /webdev

创建文件 /webdev/index.html,其中包含如下所示的单行文本:Development

在 dev 主机组中主机上浏览此目录(例如 http://servera.lab.example.com/webdev/ )将生成以下输出:

Development

解答:

[student@workstation ansible]$ vim webcontent.yml

---
- name: web station
hosts: dev
tasks:
- name: install httpd firewalld
yum:
name:
- httpd
- firewalld
state: present - name: create group
group:
name: devops
state: present - name: create /webdev
file:
path: /webdev
state: directory
group: devops
mode: 2775 - name: cp
copy:
content: Development
dest: /webdev/index.html - name: set selinux context
sefcontext:
target: /webdev(/.*)?
setype: httpd_sys_content_t - name: shell
shell:
cmd: restorecon -Rv /webdev - name: create link to /var/www/html/webdev
file:
src: /webdev
dest: /var/www/html/webdev
state: link - name: restart httpd
service:
name: httpd
state: restarted
enabled: yes - name: restart firewalld
service:
name: firewalld
state: restarted
enabled: yes - name: firewall for http
firewalld:
service: http
state: enabled
permanent: yes
immediate: yes [student@workstation ansible]$ ansible-playbook webcontent.yml 验证:
[student@workstation ansible]$ curl http://servera.lab.example.com/webdev/
Development

12、生成硬件报告

创建一个名为 /home/student/ansible/hwreport.yml的 playbook,它将在所有受管节点上生成含有以下信息的输出文件 /root/hwreport.txt:

输出文件中的每一行含有一个 key=value 对。

您的 playbook 应当:

从 http://content.example.com/hwreport.empty 下载文件,并将它保存为/root/hwreport.txt

使用正确的值修改 /root/hwreport.txt

如果硬件项不存在,相关的值应设为NONE

解答:

[student@workstation ansible]$ vim hwreport.yml
---
- name: get hwreport
hosts: all
tasks:
- name: Create report file
get_url:
url: http://content.example.com/hwreport.empty
dest: /root/hwreport.txt - name: get inventory_hostname
replace:
path: /root/hwreport.txt
regexp: 'inventoryhostname'
replace: "{{ inventory_hostname }}" - name: get mem
replace:
path: /root/hwreport.txt
regexp: 'memory_in_MB'
replace: "{{ ansible_memtotal_mb }}" - name: get bios
replace:
path: /root/hwreport.txt
regexp: 'BIOS_version'
replace: "{{ ansible_bios_version }}" - name: get vda
replace:
path: /root/hwreport.txt
regexp: 'disk_vda_size'
replace: "{{ ansible_devices.vda.size if ansible_devices.vda is defined else 'NONE'}}" - name: get vdb
replace:
path: /root/hwreport.txt
regexp: 'disk_vdb_size'
replace: "{{ ansible_devices.vdb.size if ansible_devices.vdb is defined else 'NONE'}}" [student@workstation ansible]$ ansible-playbook hwreport.yml

13、创建密码库

按照下方所述,创建一个 Ansible 库来存储用户密码:

库名称为 /home/student/ansible/locker.yml

库中含有两个变量,名称如下:

pw_developer,值为 Imadev

pw_manager,值为 Imamgr

用于加密和解密该库的密码为whenyouwishuponastar

密码存储在文件 /home/student/ansible/secret.txt中

解答:

[student@workstation ansible]$ vim locker.yml
---
pw_developer: lmadev
pw_manager: lmamgr
[student@workstation ansible]$ echo whenyouwishuponastar > secret.txt
[student@workstation ansible]$ chmod 600 secret.txt
[student@workstation ansible]$ ansible-vault encrypt locker.yml --vault-id=/home/student/ansible/secret.txt

14、创建用户账户

从 http://content.example.com/user_list.yml 下载要创建的用户的列表,并将它保存到 /home/student/ansible

在本次考试中使用在其他位置创建的密码库 /home/student/ansible/locker.yml,创建名为/home/student/ansible/users.yml 的playbook,从而按以下所述创建用户帐户:

职位描述为 developer 的用户应当:

在 dev 和 test 主机组中的受管节点上创建

从 pw_developer 变量分配密码,密码有效期为30天

是附加组 student 的成员

职位描述为 manager 的用户应当:

在 prod 主机组中的受管节点上创建

从 pw_manager 变量分配密码,密码有效期为30天

是附加组 opsmgr 的成员

密码应采用 SHA512 哈希格式。

您的 playbook 应能够在本次考试中使用在其他位置创建的库密码文件/home/student/ansible/secret.txt 正常运行

解答:

[student@workstation ansible]$ wget http://content.example.com/user_list.yml
[student@workstation ansible]$ vim users.yml
---
- name: create developer user
hosts: dev, test
vars_files:
- /home/student/ansible/locker.yml
- /home/student/ansible/user_list.yml
tasks:
- name: create group student
group:
name: student
state: present - name: create user in developer
user:
name: "{{ item.name }}"
groups: student
password: "{{ pw_developer | password_hash('sha512') }}"
state: present
loop: "{{ users }}"
when: item.job == "developer"
- name: chage
shell:
cmd: chage -M 30 {{ item.name }}
loop: "{{ users }}"
when: item.job == "developer"
- name: create manager user
hosts: prod
vars_files:
- /home/student/ansible/locker.yml
- /home/student/ansible/user_list.yml
tasks:
- name: create group opsmgr
group:
name: opsmgr
state: present - name: create user in manager
user:
name: "{{ item.name }}"
groups: opsmgr
password: "{{ pw_manager | password_hash('sha512') }}"
state: present
loop: "{{ users }}"
when: item.job == "manager"
- name: chage1
shell:
cmd: chage -M 30 {{ item.name }}
loop: "{{ users }}"
when: item.job == "manager" [student@workstation ansible]$ ansible-playbook users.yml --vault-id secret.txt

15、更新Ansible库的密钥

按照下方所述,更新现有 Ansible 库的密钥:

从 http://content.example.com/salaries.yml 下载 Ansible 库到 /home/student/ansible

当前的库密码为 AAAAAAAAA

新的库密码为 bbe2de98389b

库使用新密码保持加密状态

解答:

[student@workstation ansible]$ wget http://172.25.250.250/ansible2.8/salaries.yml
[student@workstation ansible]$ ansible-vault rekey salaries.yml
输入旧密码
输入新密码
确认新密码

16、创建⼀个名为 /home/greg/ansible/cron.yml 的 playbook ,

配置 cron 作业,该作业每隔 2 分钟运⾏并执⾏以下命令:

logger "EX294 in progress",以⽤户 natasha 身份运⾏

解答:

[student@workstation ansible]$ vim cron.yml
---
- name: create cron
hosts: all
tasks:
- name: create user
user:
name: natasha
state: present - name: create cron for all
cron:
name: cy
minute: '*/2'
job: logger "EX294 in progress"
user: natasha [student@workstation ansible]$ ansible-playbook cron.yml

RHCE习题的相关教程结束。

《RHCE习题.doc》

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