Frederick Abrams <fred@...> writes:
> ...
***
Look at /etc/rc.sysinit, by which time proc is already mounted:
...
# Configure kernel parameters
update_boot_stage RCkernelparam
<================= insert debugging statements BEFORE sysctl
sysctl -e -p /etc/sysctl.conf >/dev/null 2>&1
for file in /etc/sysctl.d/* ; do
is_ignored_file "$file" && continue
test -f "$file" && sysctl -e -p "$file" >/dev/null 2>&1
done
<================= insert debugging statements AFTER sysctl
You can modify this script and add debugging statements before and after this
code (marked <===== ), like:
echo "debugging BEFORE sysctl" >> /test.out
ls -l /proc/sys/net/ipv4/netfilter/ip_conntrack_max >> /test.out 2>&1
echo "/proc/sys/net/ipv4/netfilter/ip_conntrack_max=" >> /test.out
cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max >> /test.out 2>&1
and repectively
echo "debugging AFTER sysctl" >> /test.out
ls -l /proc/sys/net/ipv4/netfilter/ip_conntrack_max >> /test.out 2>&1
echo "/proc/sys/net/ipv4/netfilter/ip_conntrack_max=" >> /test.out
cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max >> /test.out 2>&1
***
Also, remember that:
- sysctl can load from any other file than sysctl.conf during boot time
- 'sysctl -w' can write to and modify proc
- echo "..." > /proc/... style entries can do the same from anywhere
So, it may be prudent to scan for these entries in:
grep -ir sysctl /etc/rc*
grep -ir sysctl /etc/init*
grep -ir sysctl /etc/sysconfig
grep -ir sysctl /root/
or, just to pick one of your cases:
grep -ir net.ipv4.netfilter.ip_conntrack_max /etc
grep -ir net.ipv4.netfilter.ip_conntrack_max /root
***
Last thing to consider.
Note that in that script snippet above there is this line
...
update_boot_stage RCkernelparam
...
The function update_boot_stage deals with Plymouth.
RHGB stands for RedHat Grapical Boot.
You can try to remove it (and "quiet" too for a good measure) from Grub kernel
boot line, by pressing the 'a' key at Grub startup and editing the kernel
command line.
Btw, any funny Grub kernel boot parameters beyond that ?
JB
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