Contents of /trunk/mkinitrd-magellan/klibc/usr/kinit/nfsmount/README.locking
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
File size: 1114 byte(s)
Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
File size: 1114 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | I have implemented portmap spoofing in klibc nfsmount (released as |
2 | klibc-0.144) This is basically a vestigial portmap daemon which gets |
3 | launched before the mount() call and then just records any |
4 | transactions it gets to a file and sends back an affirmative reply. |
5 | |
6 | There are two ways to use it (this belongs in a README file, but it's |
7 | too late at night right now): |
8 | |
9 | a) Set a fixed portnumber in /proc/sys/nfs/nlm_tcpport and |
10 | /proc/sys/nfs/nlm_udpport before calling nfsmount; once the portmapper |
11 | starts feed that fixed portnumber to pmap_set(8). In this case the |
12 | pmap_file can be /dev/null. |
13 | |
14 | b) Allow the kernel to bind to any port and use the file produced by |
15 | nfsroot to feed to pmap_set (it should be directly compatible); this |
16 | means the file needs to be transferred to a place where the "real |
17 | root" can find it before run-init. |
18 | |
19 | In either case, it is imperative that the real portmapper is launched |
20 | before any program actually tries to create locks! |
21 | |
22 | To use it: |
23 | |
24 | # We need the loopback device to be up before we do this! |
25 | ipconfig 127.0.0.1:::::lo:none |
26 | nfsroot -p pmap_file -o lock server:/pathname /realpath |