when I try to load a web page to terminal it gives curl: (6) Could not resolve host error.
I have internet in my PC and trying from my home internet connection. So as I there is no any proxy involve here.
[root@localhost kevin]# curl http://google.com
curl: (6) Could not resolve host: google.com; Name or service not known
clean all and tried again but no lucky.
But if I use IP instead of the domain name, it works fine.
[root@localhost kevin]# curl http://173.194.46.0
any clue please?
Sathish
3,7001 gold badge16 silver badges28 bronze badges
asked Jul 26, 2014 at 5:26
Nayana AdassuriyaNayana Adassuriya
23k28 gold badges103 silver badges145 bronze badges
5
Issues were:
- IPV6 enabled
- Wrong DNS server
Here is how I fixed it:
IPV6 Disabling
- Open Terminal
- Type
suand enter to log in as the super user - Enter the root password
- Type
cd /etc/modprobe.d/to change directory to/etc/modprobe.d/ - Type
vi disableipv6.confto create a new file there - Press
Esc + ito insert data to file - Type
install ipv6 /bin/trueon the file to avoid loading IPV6 related modules - Type
Esc + :and thenwqfor save and exit - Type
rebootto restart fedora - After reboot open terminal and type
lsmod | grep ipv6 - If no result, it means you properly disabled IPV6
Add Google DNS server
- Open Terminal
- Type
suand enter to log in as the super user - Enter the root password
- Type
cat /etc/resolv.confto check what DNS server your Fedora using. Mostly this will be your Modem IP address. - Now we have to Find a powerful DNS server. Luckily there is a open DNS server maintain by Google.
- Go to this page and find out what are the «Google Public DNS IP addresses»
- Today those are
8.8.8.8and8.8.4.4. But in future those may change. - Type
vi /etc/resolv.confto edit theresolv.conffile - Press
Esc + ifor insert data to file - Comment all the things in the file by inserting # at the begin of the each line. Do not delete anything because can be useful in future.
-
Type below two lines in the file
nameserver 8.8.8.8
nameserver 8.8.4.4-Type
Esc + :and thenwqfor save and exit - Now you are done and everything works fine (Not necessary to restart).
- But every time when you restart the computer your /etc/resolv.conf will be replaced by default. So I’ll let you find a way to avoid that.
Here is my blog post about this:
http://codeketchup.blogspot.sg/2014/07/how-to-fix-curl-6-could-not-resolve.html
answered Jul 28, 2014 at 1:29
Nayana AdassuriyaNayana Adassuriya
23k28 gold badges103 silver badges145 bronze badges
4
Perhaps you have some very weird and restrictive SELinux rules in place?
If not, try strace -o /tmp/wtf -fF curl -v google.com and try to spot from /tmp/wtf output file what’s going on.
answered Jul 26, 2014 at 11:12
5
I have today similar problem. But weirder.
- host — works
host pl.archive.ubuntu.com - dig — works on default and on all other DNS’s
dig pl.archive.ubuntu.com,dig @127.0.1.1 pl.archive.ubuntu.com - curl — doesn’t work! but for some addresses it does. WEIRD! Same in Ruby, APT and many more.
$ curl -v http://google.com/
* Trying 172.217.18.78...
* Connected to google.com (172.217.18.78) port 80 (#0)
> GET / HTTP/1.1
> Host: google.com
> User-Agent: curl/7.47.0
> Accept: */*
>
< HTTP/1.1 302 Found
< Cache-Control: private
< Content-Type: text/html; charset=UTF-8
< Referrer-Policy: no-referrer
< Location: http://www.google.pl/?gfe_rd=cr&ei=pt9UWfqXL4uBX_W5n8gB
< Content-Length: 256
< Date: Thu, 29 Jun 2017 11:08:22 GMT
<
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>302 Moved</TITLE></HEAD><BODY>
<H1>302 Moved</H1>
The document has moved
<A HREF="http://www.google.pl/?gfe_rd=cr&ei=pt9UWfqXL4uBX_W5n8gB">here</A>.
</BODY></HTML>
* Connection #0 to host google.com left intact
$ curl -v http://pl.archive.ubuntu.com/
* Could not resolve host: pl.archive.ubuntu.com
* Closing connection 0
curl: (6) Could not resolve host: pl.archive.ubuntu.com
Revelation
Eventually I used strace on curl and found that it was connection to nscd deamon.
connect(4, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = 0
Solution
I’ve restarted the nscd service (Name Service Cache Daemon) and it helped to solve this issue!
systemctl restart nscd.service
answered Jun 29, 2017 at 11:29
3
There is no need to disable IPv6 as the answer suggests. The reason curl fails is simply because the DNS resolution is missing.
There is one liner solution to this.
If you care about what is inside /etc/resolv.conf then append it:
echo 'nameserver 1.1.1.1' | sudo tee -a /etc/resolv.conf >/dev/null
I usually don’t care and just replace the content of the file:
echo 'nameserver 1.1.1.1' | sudo tee /etc/resolv.conf >/dev/null
answered Oct 11, 2021 at 17:33
HoumanHouman
63.2k86 gold badges266 silver badges455 bronze badges
0
Try nslookup google.com to determine if there’s a DNS issue.
192.168.1.254 is your local network address and it looks like your system is using it as a DNS server. Is this your gateway/modem router as well?
What happens when you try ping google.com. Can you browse to it on a Internet web browser?
answered Jul 26, 2014 at 13:25
2
In Our case, the command was passed through mail/skype and the person who needs to execute copied an extra space.
we found that extra space after an hour and removing that made it work.
answered Aug 6, 2022 at 3:20
nikhil2000nikhil2000
1493 silver badges13 bronze badges
I had an issue with IPV6 that suddenly showed up in wordpress admin where curl failed to connect to wordpress.org etc giving
An unexpected error occurred. Something may be wrong with WordPress.org
and also
Installation failed: Download failed. cURL error 28: Resolving timed out after 10005 milliseconds
I eventually sorted by adding the following as a php file in mu-plugins:
add_action( 'http_api_curl', function( $curl_handle ) { curl_setopt( $curl_handle, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4 );});
and also when using curl directly in php by using the following option in the options array:
curl_setopt_array($curl, array(CURLOPT_IPRESOLVE => CURL_IPRESOLVE_V4));
The OS is IBM i (OS400/i5OS) v7.2 running on Power 6 and the php version is 8.1.10. Interestingly IPV6 is not active on the box.
answered Sep 17, 2022 at 11:37
I have a fresh install of latest centos 7
[root@localhost ~]# cat /etc/centos-release
CentOS Linux release 7.4.1708 (Core)
[root@localhost ~]#
I wanted to install something and wget was not installed so when I tried to install wget I saw tha yum is giving error.
I saw maybe all the topics about this problem on the internet but no luck I cant find my solution.
[root@localhost ~]# yum update
Loaded plugins: fastestmirror
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
http://mirror.centos.org/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.centos.org; Unknown error"
Trying other mirror.
One of the configured repositories failed (CentOS-7 - Base),
and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:
1. Contact the upstream for the repository and get them to fix the problem.
2. Reconfigure the baseurl/etc. for the repository, to point to a working
upstream. This is most often useful if you are using a newer
distribution release than is supported by the repository (and the
packages for the previous distribution release still work).
3. Run the command with the repository temporarily disabled
yum --disablerepo=base ...
4. Disable the repository permanently, so yum won't use it by default. Yum
will then just ignore the repository until you permanently enable it
again or use --enablerepo for temporary usage:
yum-config-manager --disable base
or
subscription-manager repos --disable=base
5. Configure the failing repository to be skipped, if it is unavailable.
Note that yum will try to contact the repo. when it runs most commands,
so will have to try and fail each time (and thus. yum will be be much
slower). If it is a very temporary problem though, this is often a nice
compromise:
yum-config-manager --save --setopt=base.skip_if_unavailable=true
failure: repodata/repomd.xml from base: [Errno 256] No more mirrors to try.
http://mirror.centos.org/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.centos.org; Unknown error"
[root@localhost ~]#
So when I list the repos I get this:
[root@localhost ~]# yum repolist all
Loaded plugins: fastestmirror
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
http://mirror.centos.org/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.centos.org; Unknown error"
Trying other mirror.
http://mirror.centos.org/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.centos.org; Unknown error"
Trying other mirror.
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=centosplus&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
http://mirror.centos.org/centos/7/centosplus/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.centos.org; Unknown error"
Trying other mirror.
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=extras&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
http://mirror.centos.org/centos/7/extras/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.centos.org; Unknown error"
Trying other mirror.
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=updates&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
http://mirror.centos.org/centos/7/updates/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.centos.org; Unknown error"
Trying other mirror.
repo id repo name status
C7.0.1406-base/x86_64 CentOS-7.0.1406 - Base disabled
C7.0.1406-centosplus/x86_64 CentOS-7.0.1406 - CentOSPlus disabled
C7.0.1406-extras/x86_64 CentOS-7.0.1406 - Extras disabled
C7.0.1406-fasttrack/x86_64 CentOS-7.0.1406 - CentOSPlus disabled
C7.0.1406-updates/x86_64 CentOS-7.0.1406 - Updates disabled
C7.1.1503-base/x86_64 CentOS-7.1.1503 - Base disabled
C7.1.1503-centosplus/x86_64 CentOS-7.1.1503 - CentOSPlus disabled
C7.1.1503-extras/x86_64 CentOS-7.1.1503 - Extras disabled
C7.1.1503-fasttrack/x86_64 CentOS-7.1.1503 - CentOSPlus disabled
C7.1.1503-updates/x86_64 CentOS-7.1.1503 - Updates disabled
C7.2.1511-base/x86_64 CentOS-7.2.1511 - Base disabled
C7.2.1511-centosplus/x86_64 CentOS-7.2.1511 - CentOSPlus disabled
C7.2.1511-extras/x86_64 CentOS-7.2.1511 - Extras disabled
C7.2.1511-fasttrack/x86_64 CentOS-7.2.1511 - CentOSPlus disabled
C7.2.1511-updates/x86_64 CentOS-7.2.1511 - Updates disabled
C7.3.1611-base/x86_64 CentOS-7.3.1611 - Base disabled
C7.3.1611-centosplus/x86_64 CentOS-7.3.1611 - CentOSPlus disabled
C7.3.1611-extras/x86_64 CentOS-7.3.1611 - Extras disabled
C7.3.1611-fasttrack/x86_64 CentOS-7.3.1611 - CentOSPlus disabled
C7.3.1611-updates/x86_64 CentOS-7.3.1611 - Updates disabled
base/7/x86_64 CentOS-7 - Base enabled: 0
base-debuginfo/x86_64 CentOS-7 - Debuginfo disabled
base-source/7 CentOS-7 - Base Sources disabled
c7-media CentOS-7 - Media disabled
centosplus/7/x86_64 CentOS-7 - Plus enabled: 0
centosplus-source/7 CentOS-7 - Plus Sources disabled
cr/7/x86_64 CentOS-7 - cr disabled
extras/7/x86_64 CentOS-7 - Extras enabled: 0
extras-source/7 CentOS-7 - Extras Sources disabled
fasttrack/7/x86_64 CentOS-7 - fasttrack disabled
updates/7/x86_64 CentOS-7 - Updates enabled: 0
updates-source/7 CentOS-7 - Updates Sources disabled
repolist: 0
[root@localhost ~]#
Im not sure where can be the problem its a fresh install on my vmware/OVH dedicated server.
I have another server installed and working fine but this time I got this problem .
Any one can help me?I have also tried to enable all disabled lines in etc/yum.repo.d
my /etc/yum.repos.d/CentOS-Base.repo
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#1 2013-03-10 14:01:27
- BlackSnowflake
- Member
- Registered: 2013-03-10
- Posts: 6
could not resolve host (nil); Unknown error
Trying to install arch linux into virtualbox…
I got it to boot and everything, got my internet set up (I think), installed virtualbox guest stuff, and then had to reboot.
I try to do sudo pacman -S xorg-twm xorg-xclock xterm so that I can test X before installing a desktop enveiroment..
It then asks me for my password, the Y/N thing, etc.
And then I get a whole bunch of lines saying «error: failed retrieving file [filename] from [somewhere] : could not resolve host (nil); Unknown error»
And after that it says error: failed to commit transactions (download library error)
I follow this guide (http://wideaperture.net/blog/?p=3851), I am currently right above step 17.
Anyone knows what to do? I’m installing Arch Linux for the first time so I’m a total newbie.
#2 2013-03-10 15:12:20
- John0000
- Member
- Registered: 2012-04-12
- Posts: 40
Re: could not resolve host (nil); Unknown error
Hello,
BlackSnowflake wrote:
got my internet set up (I think)
Try
and check for replies.
Also, what is the output of
?
EDIT : quote from you link :
To set the the hostname, create the file ‘/etc/hostname’ in nano with the following command:
# nano /etc/hostname
This will bring up a blank file in nano. Type your hostname as the only line in the file. Then quit to the command line in the usual way, saving your changes as you go.
Did you do this correclty ? Check with
Last edited by John0000 (2013-03-10 15:14:42)
#3 2013-03-10 15:16:29
- BlackSnowflake
- Member
- Registered: 2013-03-10
- Posts: 6
Re: could not resolve host (nil); Unknown error
ping google.com gives me «ping: unknown host google.com»
It’s kind of hard for me to give the output of ip addr because I can’t take a screenshot (for some reason my print screen key does nothing (even when virtualbox isn’t running) but that is an issue for another time) and I can’t copy it…
#4 2013-03-10 15:27:44
- BlackSnowflake
- Member
- Registered: 2013-03-10
- Posts: 6
Re: could not resolve host (nil); Unknown error
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisk noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scop host
valid_lft forever preffered_lft forever
2: enp0s3: <BROADCAST,MULTICAST> mtu 1500 qdisk noop state DOWN qlen 1000
link/ether 08:00:27:9d:1a:5b brd ff:ff:ff:ff:ff:ff
Done. I had to look at the thing, memorise a bit, and then type it here, but this is the output of ip addr
Last edited by BlackSnowflake (2013-03-10 15:28:01)
#5 2013-03-10 15:27:49
- John0000
- Member
- Registered: 2012-04-12
- Posts: 40
Re: could not resolve host (nil); Unknown error
Alright so this is apparently network related.
I’m not expert but first I would make sure you have an hostname set up :
Then try to (re)start dhcpcd :
And check again with
.
Look at the logs also
You can make screeshot in virtualbox with ‘Host+E’ , ‘Host’ being the right ‘Ctrl’ key is you didn’t change it.
#6 2013-03-10 15:31:12
- BlackSnowflake
- Member
- Registered: 2013-03-10
- Posts: 6
Re: could not resolve host (nil); Unknown error
Checked for the hostname, had that setup.
Did sudo systemctl restart dhcpcd (it gave me an acces denied error without sudo) and retried, same thing.
journalctl told me «Showing user generated messages only. Users in the group «adm» can see all messages. pass -q to turn this notice off»
EDIT: host + E did nothing. I tried pasting my clipboard in GIMP (because that’s how screenshots work with windows, even though I use linux mint ATM) and nothing happened, suggesting there is no image copied.
Last edited by BlackSnowflake (2013-03-10 15:32:52)
#7 2013-03-10 15:39:00
- John0000
- Member
- Registered: 2012-04-12
- Posts: 40
Re: could not resolve host (nil); Unknown error
Type journalctl with sudo, then push the end key to go at the last messages.
The guide you followed said :
sudo systemctl enable dhcpcd@eth0.serviceBut with rescent archlinux changes, as you said with the result of ‘ip addr’, the base name of ethernet device has changed to enp0s3, maybe that’s why you don’t have the network. First disable the previous command :
sudo systemctl disable dhcpcd@eth0.serviceThen enable with the right name
sudo systemctl enable dhcpcd@enp0s3.serviceEither way, paste here the logs of journalctl (just type if you see some errors) after doing a
sudo systemctl restart dhcpcdWe never know, but have you checked your ethernet cable is plugged in?
For the screenshots, when I’m in virtualbox and do left ctrl+e, a window pop up to save the .png…
#8 2013-03-10 15:40:01
- ewaller
- Administrator
- From: Pasadena, CA
- Registered: 2009-07-13
- Posts: 19,013
Re: could not resolve host (nil); Unknown error
BlackSnowflake wrote:
…
2: enp0s3: <BROADCAST,MULTICAST> mtu 1500 qdisk noop state DOWN qlen 1000
link/ether 08:00:27:9d:1a:5b brd ff:ff:ff:ff:ff:ff
The network is down.
# ip link set enp0s3 up
# dhcpcd enp0s3
Should get you going. If so, then we will work through how to get it to start automatically.
One other thing. How is your virtual machine’s network configured? Bridged, NAT, or Host Only?
Last edited by ewaller (2013-03-10 15:40:42)
Nothing is too wonderful to be true, if it be consistent with the laws of nature — Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. — Alan Turing
—
How to Ask Questions the Smart Way
#9 2013-03-10 15:49:24
- BlackSnowflake
- Member
- Registered: 2013-03-10
- Posts: 6
Re: could not resolve host (nil); Unknown error
I tried all that, still the same problem when trying to do «ping google.com»
Will post the errors of journalctl that are at the end
0s3: sendmsg: Cannot assign requested adress is the only red thing I’m getting
EDIT: restarted the VM, everything is fixed now! THANKS!
Last edited by BlackSnowflake (2013-03-10 15:51:00)
#10 2013-03-10 15:58:42
- ewaller
- Administrator
- From: Pasadena, CA
- Registered: 2009-07-13
- Posts: 19,013
Re: could not resolve host (nil); Unknown error
Do you have it starting automatically, or do you want to work on that?
Nothing is too wonderful to be true, if it be consistent with the laws of nature — Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. — Alan Turing
—
How to Ask Questions the Smart Way
#11 2013-03-10 16:08:17
- BlackSnowflake
- Member
- Registered: 2013-03-10
- Posts: 6
Re: could not resolve host (nil); Unknown error
Well I suppose that I have it starting automaticly if it works when I completely restart the VM. I will be back here if that’s for some reason not the case.
Currently installing Gnome desktop, otherwise I would check.
EDIT: Everything works now, succesfully installed Gnome desktop, then removed it, then installed xfce, and internet is working.
I’m probably gonna try move it out of virtualbox later, but that’s an issue for another time.
Last edited by BlackSnowflake (2013-03-10 17:11:52)
I have installed Centos 7 in Vmware WorkStation. I tried to install few new packages using yum install. However, I was getting error “Could not resolve host: mirrorlist.centos.org Centos 7″
[root@localhost ~]# yum install dos2unix
Loaded plugins: fastestmirror
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
http://mirror.centos.org/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.centos.org; Unknown error"
Trying other mirror.
One of the configured repositories failed (CentOS-7 - Base),
and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:
1. Contact the upstream for the repository and get them to fix the problem.
2. Reconfigure the baseurl/etc. for the repository, to point to a working
upstream. This is most often useful if you are using a newer
distribution release than is supported by the repository (and the
packages for the previous distribution release still work).
3. Run the command with the repository temporarily disabled
yum --disablerepo=base ...
4. Disable the repository permanently, so yum won't use it by default. Yum
will then just ignore the repository until you permanently enable it
again or use --enablerepo for temporary usage:
yum-config-manager --disable base
or
subscription-manager repos --disable=base
5. Configure the failing repository to be skipped, if it is unavailable.
Note that yum will try to contact the repo. when it runs most commands,
so will have to try and fail each time (and thus. yum will be be much
slower). If it is a very temporary problem though, this is often a nice
compromise:
yum-config-manager --save --setopt=base.skip_if_unavailable=true
failure: repodata/repomd.xml from base: [Errno 256] No more mirrors to try.
http://mirror.centos.org/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.centos.org; Unknown error"
Possible Reason for the issue and Resolution.
1. Ethernet Interface is disabled.
Check ethernet status, if its disconnected then you need to enable it.
Steps to enable ethernet in your CentOS machine.
Step 1. Edit /etc/sysconfig/network-scripts/ifcfg-eth0 file and change ONBOOT value from no to “yes”
vi /etc/sysconfig/network-scripts/ifcfg-eth0
ONBOOT=yes
Step 2: Restart Network Service
/etc/init.d/network restart
Step 3: validate
Try “yum update” command now. If it worked then your problem is solved now.
2. There might be issue due to missing nameserver in /etc/resolv.conf . Check nameserver entry in /etc/resolv.conf . If its blank then defined nameserver
vi /etc/resolv.conf
nameserver 9.9.9.9
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About Roopendra
A DevOps Engineer, adventure trekker, having experience in various DevOps tools and technologies including Jenkins, TeamCity, Elasticsearch Logstash Kibana(ELK), Ansible and scripting languages. I am familiar working with open source technologies like Cassandra, queuing system RabbitMQ, Image Moderation using Opencv. My earlier experience includes Web Development in PHP, MySQL along with PHP cms and framework; UI technologies HTML5, CSS3, JQUERY, BOOTSTRAP and Responsive Design.
Hypervisor: Virtual Box
Hypervisor Version: 5.2.22r126460 (Qt5.6.2)
Centos installation: CentOS-7-x86_64-Minimal-1810
Centos version: CentOS Linux release 7.6.1810 (core)
Code: Select all
[root@centos ~]# hostnamectl
Static hostname: centos.localhost
Icon name: computer-vm
Chassis: vm
Machine ID: 205a932fb8c744ccb46f07f2f344c15e
Boot ID: 87713adb17774f558897935c00619583
Virtualization: kvm
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:/o:centos:centos:7
Kernel: Linux 3.10.0-957.el7.x86_64
Architecture: x86-64
VIDEO WALKTRHOUGH OF PROBLEM:
https://www.youtube.com/watch?v=iwz4vfA … e=youtu.be
Problem:
Unable to update yum package manager with working DNS?
Code: Select all
[root@centos ~]# yum -v update
Loading "fastestmirror" plugin
Config time: 0.011
Yum version: 3.4.3
rpmdb time: 0.000
Updating Everything
Building updates object
Setting up Package Sacks
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=extras&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7.6.1810releasever&arch=x86_64basearch&repo=updates&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
http://mirror.centos.org/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.centos.org; Unknown error"
Trying other mirror.
One of the configured repositories failed (CentOS-7 - Base),
and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:
1. Contact the upstream for the repository and get them to fix the problem.
2. Reconfigure the baseurl/etc. for the repository, to point to a working
upstream. This is most often useful if you are using a newer
distribution release than is supported by the repository (and the
packages for the previous distribution release still work).
3. Run the command with the repository temporarily disabled
yum --disablerepo=base ...
4. Disable the repository permanently, so yum won't use it by default. Yum
will then just ignore the repository until you permanently enable it
again or use --enablerepo for temporary usage:
yum-config-manager --disable base
or
subscription-manager repos --disable=base
5. Configure the failing repository to be skipped, if it is unavailable.
Note that yum will try to contact the repo. when it runs most commands,
so will have to try and fail each time (and thus. yum will be be much
slower). If it is a very temporary problem though, this is often a nice
compromise:
yum-config-manager --save --setopt=base.skip_if_unavailable=true
failure: repodata/repomd.xml from base: [Errno 256] No more mirrors to try.
http://mirror.centos.org/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirror.centos.org; Unknown error"
ping works?
Code: Select all
[root@centos ~]# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=119 time=53.1 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=119 time=49.0 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=119 time=47.7 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=119 time=47.0 ms
64 bytes from 8.8.8.8: icmp_seq=5 ttl=119 time=44.9 ms
64 bytes from 8.8.8.8: icmp_seq=6 ttl=119 time=40.1 ms
^C
--- 8.8.8.8 ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5173ms
rtt min/avg/max/mdev = 40.146/47.004/53.126/3.945 ms
Code: Select all
[root@centos ~]# ping google.com
PING google.com (172.217.21.142) 56(84) bytes of data.
64 bytes from arn11s02-in-f14.1e100.net (172.217.21.142): icmp_seq=1 ttl=52 time=44.3 ms
64 bytes from arn11s02-in-f14.1e100.net (172.217.21.142): icmp_seq=2 ttl=52 time=42.3 ms
64 bytes from arn11s02-in-f14.1e100.net (172.217.21.142): icmp_seq=3 ttl=52 time=35.0 ms
64 bytes from arn11s02-in-f14.1e100.net (172.217.21.142): icmp_seq=4 ttl=52 time=53.4 ms
^C
--- google.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3005ms
rtt min/avg/max/mdev = 35.056/43.808/53.488/6.576 ms
System has DNS?
Code: Select all
cat /etc/resolv.conf
# Generated by NetworkManager
search localhost
nameserver 8.8.8.8
ip info, set statically with nmtui:
Code: Select all
root@centos ~]# ip a
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: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 08:00:27:73:5f:30 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.10/24 brd 192.168.1.255 scope global noprefixroute enp0s3
valid_lft forever preferred_lft forever
inet6 fe80::a00:27ff:fe73:5f30/64 scope link
valid_lft forever preferred_lft forever
repolist:
Code: Select all
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
any ideas??
— log —
201904192318: Added repolist to post