12/4/2023 0 Comments Bash script to get ip addressHere is what we are using in SlickStack: SYSTEM_DIG_IPV4_ADDRESS=$(dig whoami. For example: /bin/bash Shell script input parsing here system-config-network-cmd -i <<EOF 192.168.1. The most reliable way is asking an outside web server to tell you what is your IP address, and the most reliable DNS servers in the world right now are owned by Cloudflare. A much better way to change IP addresses on CentOS is to use the system-network-config-cmd tool. The point is, that the ways in which it can fail are numerous and you probably should consider either a) specifying more precisely what systems you are targeting or b) whether you really need to know the IP at all - is a solution that seems to work in simple cases worth using when it fails miserably in slightly more complicated setup? If you think you need the IP, prepare a way to handle failures gracefully in cases where you either don't get the IP at all or you get a wrong one. etc/hostname: does not need to exist, on many systems it is /etc/HOSTNAME, and it does not contain IP address rather it should contain the hostname (usually the FQDN). What if the machine has more NICs? How do you tell what IP is the right one? What if only IPv6 is used on the machine's LAN? In any case, you'll get the least public IP you can (and possibly a wrong one if more interfaces are configured on the machine - which often is the case these days with omnipresent virtualization using network tap devices and/or). it has an inet address, I even dont want one having inet6). So is there a way I could get the MAC address for the first available interface that is Active.(i.e. ![]() Ifconfig: must run as root, otherwise you'd have to try /sbin/ifconfig or /usr/sbin/ifconfig as well. Also the interface eth0 may be present but is unused. With the commandline before, I get 192.168.0.85 which is the IP address of em1. ![]() Currently I make the user set the IP address. ![]() I am currently using docker-compose to create a local version of my full deployment, however I cant access it using localhost or 127.0.0.1, I have to refer to the current machines IP address, for example curl 192.168.0.23:80. How much public public IP are you looking for? What if the machine is behind NAT?Ĭurl / wget / netcat ( nc) which contains requester's address: should work most of the time, but may the site may be unreachable from the machine (be it firewall or temporary/permanent unavailability). I need to get the IP address the same way for Windows Linux and Mac OS.
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