Last several days I'm struggling with a problem.
I have two instances(ubuntu server) on gcloud and I want to assign them their external IP.
And I can ping and ssh to my instances but when I try to do telnet it is not performed.
On gcloud all instances have one internal ip and one external IP.
And they does not know their ip. I get it from gcloud console.
How could I assign it to them?
Also I've tried sudo ifconfig eth0:0 130.211.95.1 up
You can do something like this to add the external IP to a local interface:
ip addr add 130.211.95.1/32 dev eth0 label eth0:shortlabel
Replace 'add' with 'del' to remove it once you are done with it.
shortlabel can be any string up to a certain (short) length.
Update: also see this GCE support issue for related information.
A feature request for this is already filed on GCE public issue tracker, however it is not yet implemented. You can star it to get notification if any update posted on the thread.
May you also mention what's your use case? so I can probably provide you with a workaround.
Related
I have written a module that will configure network settings on my system but I can't apply the manifest because before a manifest is applied it does "facter ipaddress" to find and present global facts.
Does it mean that in order to apply puppet manifest we must have IP configured ?
So I have a system that has no IP address configured and i want to use puppet to configure that IP address for me, for that I am asking user to input IP address which i save in a .csv file, then I am using a template to configure if-eth0 file. Template will do extlookup to fill up the fields in template and template is finally called upon inside a manifest. So the problem is that before anything is applied by puppet, it fails to run with following error
facter ip address unable to resolve IP , reason anonymous
I am not sure about the actual question (if IP is indeed needed). However, if I understand correctly you can try one of the two workarounds:
Enable DHCP
This way when your system boots will take a little bit more time (assuming there is no DHCP service on the network). A timeout will occur which, in most of the cases, results in a default IP (169.254.Y.Z if I remember). In this case you may need to stop/kill the dhcp client process before applying static IP or restart the interface to get the new configuration.
Assign default static IP
If you know that puppet configuration will be applied no matter what (maybe a call in rc.local?), you can configure your interface with a static IP (ie 10.1.1.10) to avoid the error message. This is temporary since once puppet runs, the correct configuration will be applied.
Hope it helps,
Andreas
One of our application sends messages to the MSMQ that runs on the same server.
Code reference it this way in our Production environment (Note it uses the IP).
net.msmq://123.123.123.123/private/LoggingBiz/Logging.svc
We are building a secondary system and this part of the application did not work.
When we changed it the reference (in URL) to hostname it started working:
net.msmq://hostname/private/LoggingBiz/Logging.svc
When I was talking to the developer said that it might that the MSMQ does not use IP address. But it works in Production, so I am reluctant to accept theory.
I think it is environmental.
Can someone suggest what could have been gone wrong?
Regards,
RM
The hostname will just be looked up to find the IP address using DNS so I think your developer is wrong.
The IP address is then used to lookup a MAC address so if the IP is not working then I suggest there is a problem with the ARP table on the machine.
you could try clearing the IP from the ARP cache:
arp -d <ip address>
Example
arp -d 10.1.1.2
I use two DNS servers a public one (8.8.8.8)
and a local one (192.168.1.20)
In ubuntu, If I wrote both DNSs 192.168.1.20, 8.8.8.8
it will always query the first and until the first is down and then it will start querying the second.
And of course I have to make the local point again to 8.8.8.8
Like this i have almost no problems, I can resolve local addresses and also public ones
but when I'm out of the office that's were all the problems start.
Having the local DNS first makes ubuntu checks for it every single time it needs to resolve.
So I end up switching switching the priority of the DNS every (8.8.8.8, 192.168.1.20) time I change my location.
This is not the case if I was using windows. It somehow sends to both DNSs at once or something of that sort.
Is there a way to avoid changing the DNS for every location?
Ubuntu also must query each server in /etc/resolv.conf if there is no answer from the first server.
Give an output of 'dig google.com' please
You wrote 'until the first is down'...
The system of course will connect other servers ONLY if has no respond from the first one!!
The servers are listed in preferable order
Not an answer but a possible work around.
Are you able to use different network interfaces for each network?
If so you can specify different "dns-nameservers" in the "/etc/network/interfaces" file.
Is there a way to programmatically add hosts to the local name resolver under Linux?
I would rather avoid fiddling with /etc/hosts dynamically...
Example: add the name foo and bind it to the local port 127.1.2.3
Use Case: I have an application installed locally accessible through a web browser. I'd like the application to be accessible through a local URI.
add the name foo and bind it to the local port 127.0.0.1:9999
What is it that you want? You can add foo 127.0.0.1 to hosts or do the equivalent in your nameserver, but a connection to foo on port 1234 will always go to 127.0.0.1:1234 -- it's not possible to redirect that to port 9999 based on name, which is lost by the time connect is called.
On Linux you can add IPs to the loopback device (i.e. ip addr add 127.1.2.3 dev lo), and then use iptables to change all connections destined for 127.1.2.3:1234 to instead go to 127.0.0.1:9999, but I can't tell from your question if that the observable behavior you want.
If you'll only add hosts, a pretty safe way to do it is
echo -e "ip.add.re.ss\thostname" >> /etc/hosts
Now, if you want to remove them it starts getting hairy. I suspect you also want to remove them.
If this is the case you can use Dynamic DNS, for example, BIND has the nsupdate tool to update zone files:
$ nsupdate
> update delete oldhost.example.com A
> update add newhost.example.com 86400 A 172.16.1.1
> send
This does the following:
Any A records for oldhost.example.com
are deleted. And an A record for
newhost.example.com with IP address
172.16.1.1 is added. The newly-added record has a 1 day TTL (86400
seconds).
The google search term you want is "DDNS" for "Dynamic DNS". That's a technology for dynamically adding records to DNS servers, which sounds like exactly what you want. I'm pretty sure the bind in most lunix distros supports it, but you may need to read up on how to configure it.
I'll be going with a recent discovery: multicast-dns using the Avahi package. An example can be found here.
I have a Linux server with multiple ips (so, multiple eth0, eth0:0, eth0:1 etc).
The script I'm trying to start is a php CLI script which is downloading stuff from an another server API, and I would like to change the IP based on different parameters. Once the script is started, I don't need anymore to change the ip OF THAT SPECIFIC script until his end.
Do you have any clue if it is possible to achieve it?
My other solution was to install Xen or OpenVZ and create N different VPS per each IP, but as you can see is definitely a PITA :-)
You don't specify how you connect to the other server, but with sockets you can try socket_bind.
EDIT:
With curl you can try curl_setopt.
CURLOPT_INTERFACE The name of the outgoing network interface to use. This can be an interface name, an IP address or a host name.
I know how to do it in C - you use bind() on your socket before you call connect(), and you bind to the IP address assigned to the desired interface, passing 0 for port. I don't know how to do it in PHP.