centos file exists fileoutputstream

2025-1-9

其实centos file exists的问题并不复杂，但是又很多的朋友都不太了解fileoutputstream，因此呢，今天小编就来为大家分享centos file exists的一些知识，希望可以帮助到大家，下面我们一起来看看这个问题的分析吧！

CentOS7网络设置修复

服务器有两个网卡enp7s0和enp8s0

服务器需要通过enp8s0和互联网联通，互联网为笔记本转接

通过centos7界面修改ip，失败；

通过centos7的网络配置文件/etc/sysconfig/network-scripts/ifcfg-enp8s0修改ip设置

设置如下：

1.启动 service network start报错，通过journalctl-xe查看如下

-- Defined-By: systemd

-- Support:

-- Unit fprintd.service has begun starting up.

12月 29 19:31:12 crrchost dbus-daemon[851]: dbus[851]: [system] Successfully activated service'net.reactivated.Fprint'

12月 29 19:31:12 crrchost dbus[851]: [system] Successfully activated service'net.reactivated.Fprint'

12月 29 19:31:12 crrchost systemd[1]: Started Fingerprint Authentication Daemon.

-- Subject: Unit fprintd.service has finished start-up

-- Defined-By: systemd

-- Support:

-- Unit fprintd.service has finished starting up.

-- The start-up result is done.

12月 29 19:31:12 crrchost fprintd[6685]: Launching FprintObject

12月 29 19:31:12 crrchost fprintd[6685]:** Message: D-Bus service launched with name: net.reactivated.Fprint

12月 29 19:31:12 crrchost fprintd[6685]:** Message: entering main loop

12月 29 19:31:18 crrchost polkitd[835]: Operator of unix-session:1 successfully authenticated as unix-user:windfarm to gain TEMPORARY authorization for action org.freedesktop.systemd1.manage-units for system-bus

12月 29 19:31:18 crrchost systemd[1]: Starting LSB: Bring up/down networking...

-- Subject: Unit network.service has begun start-up

-- Defined-By: systemd

-- Support:

-- Unit network.service has begun starting up.

12月 29 19:31:18 crrchost network[6693]:正在打开环回接口： [ 确定 ]

12月 29 19:31:18 crrchost network[6693]:正在打开接口 enp7s0：

12月 29 19:31:24 crrchost network[6693]:正在确定 enp7s0的 IP信息...失败：不存在链接。检查电缆？

12月 29 19:31:24 crrchost network[6693]: [失败]

12月 29 19:31:24 crrchost network[6693]:正在打开接口 enp8s0： RTNETLINK answers: File exists

12月 29 19:31:25 crrchost network[6693]: [ 确定 ]

12月 29 19:31:25 crrchost network[6693]: RTNETLINK answers: File exists

12月 29 19:31:25 crrchost systemd[1]: network.service: control process exited, code=exited status=1

12月 29 19:31:25 crrchost systemd[1]: Failed to start LSB: Bring up/down networking.

-- Subject: Unit network.service has failed

-- Defined-By: systemd

-- Support:

-- Unit network.service has failed.

-- The result is failed.

12月 29 19:31:25 crrchost systemd[1]: Unit network.service entered failed state.

12月 29 19:31:25 crrchost systemd[1]: network.service failed.

12月 29 19:31:25 crrchost polkitd[835]: Unregistered Authentication Agent for unix-process:6669:319312(system bus name:1.263, object path/org/freedesktop/PolicyKit1/AuthenticationAgent, locale zh_CN.UTF-8)(d

3.systemctl status network.service查看如下：

● network.service- LSB: Bring up/down networking

Loaded: loaded(/etc/rc.d/init.d/network; bad; vendor preset: disabled)

Active: failed(Result: exit-code) since六 2018-12-29 18:38:17 CST; 1min 24s ago

Docs: man:systemd-sysv-generator(8)

Process: 909 ExecStart=/etc/rc.d/init.d/network start(code=exited, status=1/FAILURE)

12月 29 18:38:06 crrchost systemd[1]: Starting LSB: Bring up/down networking...

12月 29 18:38:06 crrchost network[909]:正在打开环回接口： [ 确定 ]

12月 29 18:38:06 crrchost network[909]:正在打开接口 enp7s0：

12月 29 18:38:12 crrchost network[909]:正在确定 enp7s0的 IP信息...失败：…？

12月 29 18:38:12 crrchost network[909]: [失败]

12月 29 18:38:17 crrchost network[909]:正在打开接口 enp8s0： [ 确定 ]

12月 29 18:38:17 crrchost systemd[1]: network.service: control process exi...=1

12月 29 18:38:17 crrchost systemd[1]: Failed to start LSB: Bring up/down n...g.

12月 29 18:38:17 crrchost systemd[1]: Unit network.service entered failed...e.

12月 29 18:38:17 crrchost systemd[1]: network.service failed.

Hint: Some lines were ellipsized, use-l to show in full.

1.参考网络方法停用NetworkManager，依旧报错

systemctl stop NetworkManager

systemctl disable NetworkManager

2.比对两个网卡的MAC地址和配置文件的MAC地址

a.查看mac地址配置，ipconfig

b.查看配置文件中的macd地址是否匹配，ifcfg-enp8s0和ifcfg-enp7s0,

按照网络方法增加一行HWADDR=ipconfig查询到的对应网卡MAC地址；

c.重启network服务依旧报错；

3.通过GUI界面查看网络，提示“系统的网络服务与此版本的网络管理器不兼容”

这与之前停掉NetworkManager有关，此处不表；

4.因为ifcfg-enp7s0实际上没有插网线，修正其配置文件如下：

ONBOOT=no

重新启动服务后网络正常；

5.检查网络

1.network和NetworkManager不同，通过界面和通过配置文件，可能会导致配置混乱，且NetworkManager有些程序不支持，需要停用；

2.BOOTPROTO=none虽然可以表示静态ip，但是如果要启用，必须设置其为

BOOTPROTO=static或BOOTPROTO=dhcp

3.一个网卡没哟被启用，也就是没有设置动态ip或静态ip，是无法被初始化的，不能设置ONBOOT=yes

In Centos7.0 disabling NetworkManager will leave a dhcp client running configured for NetworkManager. This causes the error message RTNETLINK answers: File exists when the network service is started.

The stale dhclient process has the additional"benefit" that when the lease expires your dhclientwill choke, since it cannot reach NetWorkManager, thus removing your IP address.

If you grep for it, you will see that it points to a NetWorkManager configuration file.

[root@host~]# ps-ef| grep dhc

root 1865 792 0 Apr28? 00:00:00/sbin/dhclient-d-sf\

/usr/libexec/nm-dhcp-helper-pf/var/run/dhclient-eno1.pid-lf\

/var/lib/NetworkManager/dhclient-c96e56d3-a4c9-4a87-85ca-93dc0ca268f2-eno1.lease\

-cf/var/lib/NetworkManager/dhclient-eno1.conf eno1

So what you can do is kill the dhclient and only then start your network service.

...启动网卡错误:RTNETLINK answers:File exists

原因：由于用模板克隆虚拟机，所以网卡的配置文件也会进行克隆，克隆之后网卡的名称也会相应改变，如模板机上是eth0和eth1,克隆机变成eth2和eth3,而网卡的配置文件并没有改变，会冲突。

解决方法：

更改网卡的名称。正常来说，linux在识别网卡时第一张会是eth0，第二张才是eth1。在这里成这样是因为复制系统的过程中复制的文件已经有2个网卡在/etc/udev/rules.d/70-persistent-net.rules被识别成了eth0，而虚拟机中的识别成了eth1。

编辑/etc/udev/rules.d/70-persistent-net.rules

找到与ifconfig-a得出的MAC相同的一行（NAME='eth2'这一行），把它改为"NAME=eth0"，然后把上面一行（NAME='eth0'）删除掉。

（NAME='eth3'这一行），把它改为"NAME=eth1"，

wKioL1YFCGTQluvcAAL5ul22xak422.jpg

2查看MAC地址，编辑/etc/sysconfig/network-script/ifcfg-eth0和ifcfg-eth1

把MAC改为正确的，把UUID删掉。

centOS7下重启网络服务报错

centos7无法启动网络(service network restart)错误由多种因素引起，应针对性解决：

1、和 NetworkManager服务有冲突，直接关闭 NetworkManger服务就好了，执行service NetworkManager stop，并且禁止开机启动 chkconfig NetworkManager off，之后重启就好了；

2、和配置文件的MAC地址不匹配，直接修改/etc/udev/rules.d/70-persistent-net.rules文件的MAC地址和/etc/sysconfig/network-scripts/ifcfg-eth0一样就好了。

3、执行 service network restart出现以下错误：

Restarting network(via systemctl): Job for network.service failed. See'systemctl status network.service'

and'journalctl-xn' for details.

:根据上面的提示，执行“systemctl status network.service”输出以下的类似信息：

[root@localhost~]# systemctl status network.service

network.service- LSB: Bring up/down networking

Loaded: loaded(/etc/rc.d/init.d/network)

Active: failed(Result: exit-code) since三 2014-11-05 15:30:10 CST; 1min 5s ago

11月 05 15:30:10 localhost.localdomain network[2920]: RTNETLINK answers: File exists

11月 05 15:30:10 localhost.localdomain systemd[1]: network.service: control process exited, code=exited

status=1

11月 05 15:30:10 localhost.localdomain systemd[1]: Failed to start LSB: Bring up/down networking.

11月 05 15:30:10 localhost.localdomain systemd[1]: Unit network.service entered failed state.

解决的办法，就是修改mac地址。

查看centos7复制出来的虚拟机的mac地址，需要执行“ip addr”，输出如下的类似信息：

[root@localhost~]# ip addr

1: lo:

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: eno16777736:

link/ether00:0f:19:10:12:f1 brd ff:ff:ff:ff:ff:ff

inet 192.168.38.135/24 brd 192.168.38.255 scope global dynamic eno16777736

valid_lft 1681sec preferred_lft 1681sec

inet6 fe80::20c:11aa:ae11:4fe4/64 scope link

valid_lft forever preferred_lft forever

注意上面加粗加红的字，这就是新的mac地址。

接下来就剩下修改ifcfg-XXX文件了，只修改HWADDR就可以了。接下来执行service network restart就正常了。

阅读剩余

作者：云服务器测评

链接：https://www.i40.top/linux/4803.html

文章版权归作者所有，未经允许请勿转载。

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