On Wed, December 10, 2014 17:51, Gordon Messmer wrote: > On 12/10/2014 12:47 PM, Dan Hyatt wrote: >> I've a virtual instance and I need to know its IP address after it has >> finished booting up, to know where to ssh into it. I've tried adding >> "ip -4 addr > /dev/tty0" to rc.local, but that obviously doesn't work, >> because the login prompt overwrites everything I do. > > The easy answer would be: don't fight the login prompt. "agetty" writes > the contents of /etc/issue to the console before the login prompt. If > /etc/issue contains "\4" then agetty will print the IPv4 address to the > console. > > See the man page for agetty, and update /etc/issue. > > I find that CentOS-6 evidently does not support \; nor many of the /etc/issue flags defined in man 1 agetty: /etc/issue CentOS release 6.6 (Final) Kernel \r on an \m Test: b:\b d:\d s:\s l:\l m:\m n:\n o:\o O:\O r:\r t:\t u:\u 0:\0 4:\4 6:\6 login: CentOS release 6.6 (Final) Kernel 2.6.32-504.1.3.el6.centos.plus.x86_64 on an x86_64 Test: b: d:09:19 on Thursday, 11 December 2014 s:Linux l:7 m:x86_64 n:vhost04.hamilton.harte-lyne.ca o: O: r:2.6.32-504.1.3.el6.centos.plus.x86_64 t:09:19 on Thursday, 11 December 2014 u: 0: 4: 6: For ease in analysis (note that flags \0, \4, and \6 are not defined in agetty): b: d:09:19 on Thursday, 11 December 2014 s:Linux l:7 m:x86_64 n:vhost04.hamilton.harte-lyne.ca o: O: r:2.6.32-504.1.3.el6.centos.plus.x86_64 t:09:19 on Thursday, 11 December 2014 u: 0: 4: 6: Is there some configuration issue of which I am unaware? Where is the flag \4 usage defined? -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB at Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3