openEuler 系统及进程管理
6.1 实验介绍
6.1.1 实验介绍
本实验主要介绍 openEuler 的计划任务、系统管理和服务管理等内容。
6.1.2 实验目标
掌握系统任务管理方法；
掌握 openEuler 网络管理配置；
掌握 openEuler 系统服务管理。
6.2 任务管理
6.2.1 临时任务管理
步骤 1 使用 putty 登录虚拟机。
步骤 2 执行如下命令添加单次任务，输入完成后按组合键 Ctrl-D。
[root@openEuler ~]# at now+5min
warning: commands will be executed using /bin/sh
at> echo “aaa” >> /tmp/at.log
at> echo “bbb” >> /tmp/at.log
at> date >> /tmp/at.log
at> #此处按 Ctrl+D 组合键
job 1 at Thu Jul 2 11:21:00 2020
[root@openEuler ~]# at 22:00
warning: commands will be executed using /bin/sh
at> pwd >> /tmp/check.log
at> #此处按 Ctrl+D 组合键
job 2 at Thu Jul 2 22:00:00 2020
步骤 3 执行如下命令查询任务列表。
[root@openeuler ~]# atq #左侧数字表示任务 ID
2 Thu Jul 2 22:00:00 2020 a root
1 Thu Jul 2 11:21:00 2020 a root
步骤 4 执行如下命令查看任务详细信息。HCIA-openEuler 实验指导手册 第 107 页
[root@openEuler ~]# at -c 1
#!/bin/sh
atrun uid=0 gid=0
mail root 0
umask 77
SHELL=/bin/bash; export SHELL
HISTCONTROL=; export HISTCONTROL
HISTSIZE=1000; export HISTSIZE
HOSTNAME=openEuler; export HOSTNAME
HISTTIMEFORMAT=; export HISTTIMEFORMAT
GOMP_CPU_AFFINITY=0-1; export GOMP_CPU_AFFINITY
PWD=/root; export PWD
LOGNAME=root; export LOGNAME
XDG_SESSION_TYPE=tty; export XDG_SESSION_TYPE
HOME=/root; export HOME
SSH_ASKPASS=/usr/libexec/openssh/gnome-ssh-askpass; export SSH_ASKPASS
LANG=en_US.UTF-8; export LANG
PROMPT_COMMAND=openEuler_history; export PROMPT_COMMAND
SSH_CONNECTION=172.19.130.180\ 51500\ 192.168.110.248\ 22; export SSH_CONNECTION
XDG_SESSION_CLASS=user; export XDG_SESSION_CLASS
SELINUX_ROLE_REQUESTED=; export SELINUX_ROLE_REQUESTED
USER=root; export USER
SELINUX_USE_CURRENT_RANGE=; export SELINUX_USE_CURRENT_RANGE
SHLVL=1; export SHLVL
XDG_SESSION_ID=3; export XDG_SESSION_ID
XDG_RUNTIME_DIR=/run/user/0; export XDG_RUNTIME_DIR
SSH_CLIENT=172.19.130.180\ 51500\ 22; export SSH_CLIENT
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin; export PATH
SELINUX_LEVEL_REQUESTED=; export SELINUX_LEVEL_REQUESTED
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/0/bus; export
DBUS_SESSION_BUS_ADDRESS
MAIL=/var/spool/mail/root; export MAIL
SSH_TTY=/dev/pts/0; export SSH_TTY
OLDPWD=/root; export OLDPWD
cd /root || {
echo ‘Execution directory inaccessible’ >&2
exit 1
}
${SHELL:-/bin/sh} << ‘marcinDELIMITER42ada33e’
echo “aaa” >> /tmp/at.log
echo “bbb” >> /tmp/at.log
date >> /tmp/at.log
marcinDELIMITER42ada33e
步骤 5 执行如下命令删除临时任务。
[root@openEuler ~]# atrm 2
[root@openEuler ~]# atq #若前述步骤操作的慢，可能导致此处查询没有任务
[root@openEuler ~]# cat /tmp/at.log #可以查看第一个临时任务执行结果HCIA-openEuler 实验指导手册 第 108 页
aaa
bbb
Thu Jul 2 11:21:00 CST 2020
6.2.2 周期任务管理
步骤 1 执行如下步骤管理周期任务。
[root@openeuler ~]# crontab -l #查询系统当前用户的 cron 定时任务
no crontab for root
[root@openeuler ~]#crontab -e #crontab 将会打开一个编辑器，请在编辑器中输入如下内容，保存
退出
5 * * * * date >> /tmp/croncheck.log
*/2 * * * * id >> /tmp/cronuser.log
[root@openeuler ~]# crontab -l #查询系统当前用户的 cron 定时任务
5 * * * * date >> /tmp/croncheck.log
*/2 * * * * id >> /tmp/cronuser.log
[root@openEuler ~]# crontab -r #删除当前用户的所有计划任务
[root@openEuler ~]# crontab -l
no crontab for root
任务：创建一个计划任务，周一到周五的晚上 1 点到 2 点，每隔五分钟执行
往/mnt/test.txt 里面记录一下当前系统时间。
6.3 网络管理
6.3.1 主机名管理
步骤 1 执行如下命令查看主机名。
[root@openEuler ~]# hostname
openEuler
[root@openEuler ~]# cat /etc/hostname #这个文件是主机名的配置文件
openEuler
步骤 2 执行如下命令临时修改主机名。
[root@openEuler ~]# hostname huawei #临时修改主机名，重启失效
[root@openEuler ~]# hostname
huawei
[root@openEuler ~]# bash #重新启动一个会话
Welcome to 4.19.90-2003.4.0.0036.oe1.x86_64
System information as of time: Thu Jul 2 11:45:09 CST 2020
System load: 0.00
Processes: 178
Memory used: 18.5%
Swap used: 0.0%
Usage On: 9%
IP address: 192.168.110.248
Users online: 2HCIA-openEuler 实验指导手册 第 109 页
[root@huawei ~]# #可以看到前面的提示符里，主机名已经变成了 huawei
[root@huawei ~]# exit
exit
[root@openEuler ~]#
步骤 3 执行如下步骤永久修改主机名。
方法一：
[root@openEuler ~]# hostnamectl set-hostname huawei #此种方法不需要重启，重新登录即
可
方法二：
[root@openEuler ~]# vim /etc/hostname
#修改此文件中主机名，保存退出即可，需要重启才可以生效。
[root@openEuler ~]# reboot
6.3.2 网 络管理
步骤 1 执行如下步骤使用 IP 命令修改网卡 IP 地址。
[root@openEuler ~]# ip addr show #显示当前主机的 IP 信息
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group
default qlen 1000
link/ether 28:6e:d4:8a:2b:b6 brd ff:ff:ff:ff:ff:ff
inet 192.168.110.247/24 brd 192.168.110.255 scope global dynamic nopreffxroute enp4s0
valid_lft 847084sec preferred_lft 847084sec
inet6 fe80::382e:b477:10e8:f0b6/64 scope link nopreffxroute
valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
group default qlen 1000
link/ether 52:54:00:69:ec:cd brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel master virbr0 state DOWN
group default qlen 1000
link/ether 52:54:00:69:ec:cd brd ff:ff:ff:ff:ff:ff
[root@openEuler ~]# ip addr add 192.168.110.100/24 dev enp4s0
[root@openEuler ~]# ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host HCIA-openEuler 实验指导手册 第 110 页
valid_lft forever preferred_lft forever
2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group
default qlen 1000
link/ether 28:6e:d4:8a:2b:b6 brd ff:ff:ff:ff:ff:ff
inet 192.168.110.247/24 brd 192.168.110.255 scope global dynamic nopreffxroute enp4s0
valid_lft 846990sec preferred_lft 846990sec
inet 192.168.110.100/24 scope global secondary enp4s0
valid_lft forever preferred_lft forever
inet6 fe80::382e:b477:10e8:f0b6/64 scope link nopreffxroute
valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
group default qlen 1000
link/ether 52:54:00:69:ec:cd brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel master virbr0 state DOWN
group default qlen 1000
link/ether 52:54:00:69:ec:cd brd ff:ff:ff:ff:ff:ff
[root@openEuler ~]# ip addr del 192.168.110.100/24 dev enp4s0
[root@openEuler ~]# ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group
default qlen 1000
link/ether 28:6e:d4:8a:2b:b6 brd ff:ff:ff:ff:ff:ff
inet 192.168.110.247/24 brd 192.168.110.255 scope global dynamic nopreffxroute enp4s0
valid_lft 846884sec preferred_lft 846884sec
inet6 fe80::382e:b477:10e8:f0b6/64 scope link nopreffxroute
valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
group default qlen 1000
link/ether 52:54:00:69:ec:cd brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel master virbr0 state DOWN
group default qlen 1000
link/ether 52:54:00:69:ec:cd brd ff:ff:ff:ff:ff:ff
步骤 2 执行如下命令配置静态路由。
[root@openEuler ~]# ip route
default via 192.168.110.254 dev enp4s0 proto dhcp metric 100
192.168.110.0/24 dev enp4s0 proto kernel scope link src 192.168.110.247 metric 100
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown
[root@openEuler ~]# ip route add 192.168.2.1 via 192.168.110.254 dev enp4s0HCIA-openEuler 实验指导手册 第 111 页
[root@openEuler ~]# ip route
default via 192.168.110.254 dev enp4s0 proto dhcp metric 100
192.168.2.1 via 192.168.110.254 dev enp4s0
192.168.110.0/24 dev enp4s0 proto kernel scope link src 192.168.110.247 metric 100
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown
步骤 3 执行如下步骤使用 nmcli 命令修改主机 IP 地址。
[root@openEuler ~]# nmcli general status
STATE CONNECTIVITY WIFI-HW WIFI WWAN-HW WWAN
connected full enabled enabled enabled enabled
[root@openEuler ~]# nmcli connection show
NAME UUID TYPE DEVICE
enp4s0 90dbef32-15b2-3400-81c7-f98ece257a55 ethernet enp4s0
virbr0 d798e4ce-2296-4b6e-9dba-9a4b994d0b82 bridge virbr0
[root@openEuler ~]# nmcli device status
DEVICE TYPE STATE CONNECTION
enp4s0 ethernet connected enp4s0
virbr0 bridge connected virbr0
lo loopback unmanaged –
virbr0-nic tun unmanaged –
[root@openEuler ~]# nmcli con add type ethernet con-name net-static ifname enp4s0
ip4 192.168.110.10/24 gw4 192.168.110.254
[root@openEuler ~]# nmcli con up net-static ifname enp4s0
步骤 4 执行如下步骤使用 nmcli 命令配置静态路由。
[root@openEuler ~]# nmcli connection modify enp4s0 +ipv4.routes “192.168.100.0/24
192.168.110.254”
步骤 5 执行如下步骤通过修改 ifcfg 文件修改主机 IP 地址。
[root@openEuler ~]# cat /etc/sysconffg/network-scripts/ifcfg-enp4s0
TYPE=Ethernet #配置文件接口类型
PROXY_METHOD=none #代理方式
BROWSER_ONLY=no #只浏览
BOOTPROTO=dhcp #系统启动地址协议
DEFROUTE=yes #默认路由
IPV4_FAILURE_FATAL=no #是否一定要进行 ipv4 检查
IPV6INIT=yes #是否执行 IPv6
IPV6_AUTOCONF=yes #IPv6 自动配置
IPV6_DEFROUTE=yes #IPv6 默认路由
IPV6_FAILURE_FATAL=no #是否一定要进行 ipv6 检查
IPV6_ADDR_GEN_MODE=stable-privacy #I Pv6 地址生成方式
NAME=enp4s0 #网络连接的名字
UUID=90dbef32-15b2-3400-81c7-f98ece257a55 #设备 UUID
ONBOOT=yes #随系统启动
AUTOCONNECT_PRIORITY=-999 #自动连接优先级
DEVICE=enp4s0 #物理设备的名字
###配置网络时可以将 dhcp 修改成 static 或者 none，然后增加如下信息：
IPADDR=192.168.100.11 HCIA-openEuler 实验指导手册 第 112 页
NETMASK=255.255.255.0
GATEWAY=192.168.110.254
DNS1=114.114.114.114
###如何生效
[root@openEuler ~]# ifdown enp4s0
[root@openEuler ~]# ifup enp4s0
步骤 6 执行如下命令修改/etc/resolv.conf，用来指向 DNS 服务器地址。
[root@openEuler ~]# dnf -y install bind-utils
[root@openEuler ~]# vim /etc/resolv.conf
nameserver 192.168.137.1 #改文件的格式是 nameserver IP ，IP 地址为 DNS 服务器 IP
#修改完成后保存退出
[root@openEuler ~]# nslookup openeuler.org
Server: 192.168.137.1
Address: 192.168.137.1#53
Non-authoritative answer:
Name: openeuler.org
Address: 159.138.7.136
[root@openEuler ~]# ping openeuler.org -c 3
PING openeuler.org (159.138.7.136) 56(84) bytes of data.
64 bytes from ecs-159-138-7-136.compute.hwclouds-dns.com (159.138.7.136): icmp_seq=1
ttl=40 time=52.3 ms
64 bytes from ecs-159-138-7-136.compute.hwclouds-dns.com (159.138.7.136): icmp_seq=2
ttl=40 time=51.8 ms
64 bytes from ecs-159-138-7-136.compute.hwclouds-dns.com (159.138.7.136): icmp_seq=3
ttl=40 time=52.5 ms
— openeuler.org ping statistics —
3 packets transmitted, 3 received, 0% packet loss, time 2005ms
rtt min/avg/max/mdev = 51.764/52.157/52.452/0.289 ms
步骤 7 执行如下命令修改/etc/hosts。
[root@openEuler ~]# vim /etc/hosts #hosts 是系统中一个负责 IP 地址与域名快速解析的文件，在最
后新增一行，输入如下信息：
159.138.7.136 server #新增这一行，完成后保存退出
[root@openEuler ~]# ping server -c 3
PING server (159.138.7.136) 56(84) bytes of data.
64 bytes from server (159.138.7.136): icmp_seq=1 ttl=40 time=53.3 ms
64 bytes from server (159.138.7.136): icmp_seq=2 ttl=40 time=51.3 ms
64 bytes from server (159.138.7.136): icmp_seq=3 ttl=40 time=52.4 ms
— server ping statistics —
3 packets transmitted, 3 received, 0% packet loss, time 2005ms
rtt min/avg/max/mdev = 51.288/52.351/53.338/0.838 msHCIA-openEuler 实验指导手册 第 113 页
6.4 防火墙管理
步骤 1 查看防火墙状态。
[root@openEuler ~]# service iptables save
iptables: Saving ffrewall rules to /etc/sysconffg/iptables: [ OK ]
[root@openEuler ~]# systemctl status ffrewalld.service
● ffrewalld.service - ffrewalld - dynamic ffrewall daemon
Loaded: loaded (/usr/lib/systemd/system/ffrewalld.service; enabled; vendor preset: enabled)
Active: inactive (dead) since Fri 2020-07-31 10:51:17 CST; 5h 17min ago
Docs: man:ffrewalld(1)
Main PID: 1908 (code=exited, status=0/SUCCESS)
Jul 08 11:19:39 localhost.localdomain systemd[1]: Starting ffrewalld - dynamic ffrewall
daemon…
Jul 08 11:19:40 localhost.localdomain systemd[1]: Started ffrewalld - dynamic ffrewall daemon.
Jul 31 10:51:15 openEuler systemd[1]: Stopping ffrewalld - dynamic ffrewall daemon…
Jul 31 10:51:17 openEuler systemd[1]: ffrewalld.service: Succeeded.
Jul 31 10:51:17 openEuler systemd[1]: Stopped ffrewalld - dynamic ffrewall daemon.
[root@openEuler ~]# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
######iptables 默认的规则链######
INPUT：处理入站数据包
OUTPUT：处理出站数据包
FORWARD：处理转发数据包
POSTROUTING 链：在进行路由选择后处理数据包
PREROUTING 链：在进行路由选择前处理数据包
步骤 2 启动防火墙
[root@openEuler ~]# systemctl start ffrewalld.service #启动防火墙服务
[root@openEuler ~]# ffrewall-cmd --version #查看防火墙 ffrewalld 版本
0.6.2
[root@openEuler ~]# ffrewall-cmd --help #查看帮助
[root@openEuler ~]# ffrewall-cmd --state #查看运行状态
running
[root@openEuler ~]# ffrewall-cmd --list-all #查看防火墙配置信息
public (active)
target: default
icmp-block-inversion: no
interfaces: enp4s0HCIA-openEuler 实验指导手册 第 114 页
sources:
services: ssh mdns dhcpv6-client
ports:
protocols:
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:
步骤 3 配置防火墙放通规则
[root@openEuler ~]# ffrewall-cmd --panic-on #拒绝所有包
[root@openEuler ~]# ffrewall-cmd --panic-off #取消拒绝所有包
[root@openEuler ~]# ffrewall-cmd --query-panic #查看是否拒绝
[root@openEuler ~]# ffrewall-cmd --reload #更新防火墙规则，无需断开
[root@openEuler ~]# ffrewall-cmd --zone=public --add-interface=enp4s0 #将网口添加到
区域，默认都在 public
[root@openEuler ~]# ffrewall-cmd --set-default-zone=public #设置默认接口区域
[root@openEuler ~]# [root@openEuler ~]# ffrewall-cmd --zone=public --list-ports #查
看所有打开的端口
[root@openEuler ~]# ffrewall-cmd --zone=public --add-port=8080/tcp --permanent #永久打
开 tcp 8080 端口
[root@openEuler ~]# [root@openEuler ~]# ffrewall-cmd --zone=public --add-service=http
#打开一个服务
[root@openEuler ~]# systemctl restart ffrewalld.service
[root@openEuler ~]# ffrewall-cmd --list-all
public (active)
target: default
icmp-block-inversion: no
interfaces: enp4s0
sources:
services: ssh mdns dhcpv6-client http
ports: 8080/tcp
protocols:
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:
6.5 服务管理
6.5.1 管理系统服务
步骤 1 显示当前服务。
[root@openEuler ~]# systemctl list-units --type service
UNIT LOAD ACTIVE SUB DESCRIPTIONHCIA-openEuler 实验指导手册 第 115 页
atd.service loaded active running Deferred execution scheduler
auditd.service loaded active running Security Auditing Service
chronyd.service loaded active running NTP client/server
crond.service loaded active running Command Scheduler
dbus.service loaded active running D-Bus System Message Bus
dkms.service loaded active exited Builds and install new kernel modules
throug
dracut-shutdown.service loaded active exited Restore /run/initramfs on shutdown
ffrewalld.service loaded active running ffrewalld - dynamic ffrewall daemon
getty@tty1.service loaded active running Getty on tty1
gssproxy.service loaded active running GSSAPI Proxy Daemon
hwclock-save.service loaded active exited Update RTC With System Clock
步骤 2 显示服务状态，如防火墙服务。
[root@openEuler ~]# systemctl status ffrewalld.service #查看服务状态
● ffrewalld.service - ffrewalld - dynamic ffrewall daemon
Loaded: loaded (/usr/lib/systemd/system/ffrewalld.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2020-07-06 09:52:14 CST; 5h 33min ago
Docs: man:ffrewalld(1)
Main PID: 1863 (ffrewalld)
Tasks: 2
Memory: 61.3M
CGroup: /system.slice/ffrewalld.service
└─1863 /usr/bin/python3 /usr/sbin/ffrewalld --nofork --nopid
Jul 06 09:52:13 openEuler systemd[1]: Starting ffrewalld - dynamic ffrewall daemon…
Jul 06 09:52:14 openEuler systemd[1]: Started ffrewalld - dynamic ffrewall daemon.
[root@openEuler ~]# systemctl is-active ffrewalld.service #查看服务是否运行
active
[root@openEuler ~]# systemctl is-enabled ffrewalld.service #查看服务是否被启用
enabled
步骤 3 终止服务，如防火墙服务。
[root@openEuler ~]# systemctl stop ffrewalld.service
[root@openEuler ~]# systemctl is-active ffrewalld.service
inactive
步骤 4 重启服务，如防火墙。
[root@openEuler ~]# systemctl restart ffrewalld.service
[root@openEuler ~]# systemctl is-active ffrewalld.service
active
步骤 5 禁用服务，如防火墙。
[root@openEuler ~]# systemctl disable ffrewalld.service
Removed /etc/systemd/system/multi-user.target.wants/ffrewalld.service.
Removed /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[root@openEuler ~]# systemctl is-enabled ffrewalld.serviceHCIA-openEuler 实验指导手册 第 116 页
disabled
步骤 6 启用服务，如防火墙
[root@openEuler ~]# systemctl enable ffrewalld.service
Created symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service →
/usr/lib/systemd/system/ffrewalld.service.
Created symlink /etc/systemd/system/multi-user.target.wants/ffrewalld.service →
/usr/lib/systemd/system/ffrewalld.service.
[root@openEuler ~]# systemctl is-enabled ffrewalld.service
enabled