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If you want to open, for instance, port 32 to any peer:
# iptables -I INPUT -p tcp –dport 32 -j ACCEPT
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This one replicates all from /200gb/DOCS to the server called “sol” and removes files in “sol” that we deleted locally. the
“c” is for checksum, the “t” is for updating
rsync -crtva –delete /200gb/DOCS/ root@sol:/200gb/DOCS/
if we want to copy locally from /a to /b, but never change /a
rsync -crtva /a/ /b/
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If you don’t have direct access from your PC to the cluster server, but another unix jumphost has, you can do the same
as for the dracs and the ilos.
The connectivity is
PC-jumphost-clusternode
in your PC you can do a:
ssh -g jumphost -L 14141:clusternode:14141 -L 14150:clusternode:14150
Then, open the “Veritas Cluster Manager” software in your PC, and point it to “localhost”, and you’ll be
managing the remote cluster 🙂
For Veritas Enterprise Administrator (vea), we only need to forward one port:
ssh -g jumphost -L 2148:veanode: 2148

if you’re bad at transforming hex to dec or viceversa
http://www.softwareeffect.com/tools/netmask.html
– rdircio
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To determine the maximum size of a shared memory segment, run:
# cat /proc/sys/kernel/shmmax
2147483648
The default shared memory limit for SHMMAX can be changed in the proc file system without reboot:
# echo 2147483648 > /proc/sys/kernel/shmmax
Alternatively, you can use sysctl(8) to change it:
# sysctl -w kernel.shmmax=2147483648
To make a change permanent, add the following line to the file /etc/sysctl.conf (your setting may vary).
This file is used during the boot process.
# echo “kernel.shmmax=2147483648” >> /etc/sysctl.conf
We also got this:
Checking kernel
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parameters
Checking for
semmsl=250; found semmsl=250. Passed
Checking for
semmns=32000; found semmns=32000. Passed
Checking for
semopm=100; found semopm=32. Failed
<<<<
Checking for
semmni=128; found semmni=128. Passed
Checking for
shmmax=536870912; found shmmax=33554432. Failed
<<<<
Checking for
shmmni=4096; found shmmni=4096. Passed
Checking for
shmall=2097152; found shmall=2097152. Passed
Checking for
file-max=65536; found file-max=751357. Passed
Checking for
VERSION=2.6.9; found VERSION=2.6.9-55.0.0.0.2.ELlargesmp.
Passed
Checking for
ip_local_port_range=1024 – 65000; found ip_local_port_range=32768
– 61000. Failed
<<<<
Checking for
rmem_default=262144; found rmem_default=135168. Failed
<<<<
Checking for
rmem_max=262144; found rmem_max=135168. Failed
<<<<
Checking for
wmem_default=262144; found wmem_default=135168. Failed
<<<<
Checking for
wmem_max=262144; found wmem_max=135168. Failed
<<<<
Check complete. The
overall result of this check is: Failed
<<<<
Problem: The kernel
parameters do not meet the minimum requirements (see
above).
Recommendation: Perform
operating system specific instructions to update the kernel
parameters.
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so for semopm we do a:
[root@irwdbd1 ~]# ipcs -ls
—— Semaphore Limits ——–
max number of arrays = 128
max semaphores per array = 250
max semaphores system wide = 32000
max ops per semop call = 32
semaphore max value = 32767
and set it to be changed on reboot as:
[root@server ~]# echo “kernel.sem=250 32000 100 128” >> /etc/sysctl.conf
set it also live as:
[root@server ~]# echo “250 32000 100 128” > /proc/sys/kernel/sem
For the rest, i just added these lines to /etc/sysctl.conf:
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default=262144
net.core.wmem_default=262144
net.core.rmem_max=262144
net.core.wmem_max=262144
and ran a
[root@server ~]# /sbin/sysctl -p
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
kernel.sem = 250 32000 100 128
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kernel.shmmax = 536870912
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default = 262144
net.core.wmem_default = 262144
net.core.rmem_max = 262144
net.core.wmem_max = 262144
You can also run these commands to get the variables oracle recommends to tune:
sysctl -a | grep -i shmmni
sysctl -a | grep -i ‘kernel.sem’
sysctl -a | grep -i ip_local_port_range
sysctl -a | grep -i rmem_default
sysctl -a | grep -i rmem_max
sysctl -a | grep -i wmem_default
sysctl -a | grep -i wmem_max
sysctl -a | grep -i shmmax
You will get something like:
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default = 262144
net.core.rmem_max = 262144
net.core.wmem_default = 262144
net.core.wmem_max = 262144
kernel.shmmax = 2147483648
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If for any reason your vcs node falls into STALE_ADMIN_WAIT, issue
# hasys -force <nodename>
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Soalris doesn’t have md5sum, so there’s a workaround
digest -a md5 -v /path/file
Thx to Justin Lim
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zfs set mountpoint=/mount/point/dir mypool/myfs
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# chage -d 0 username
Unlock account
In redhat…
# passwd -u rdircio
# faiilog -u rdircio -r
pwconv and pwck cannot lock /etc/passwd
[root@myserver root]# pwck
pwck: cannot lock file /etc/passwd
you need to remove the lock file
[root@myserver root]# ls -la /etc/.pwd.lock
-rw——- 1 root root 0 Jul 14 2003 /etc/.pwd.lock
[root@myserver root]# rm /etc/.pwd.lock
rm: remove `/etc/.pwd.lock’? y
[root@dbn-ie2k214 root]# pwck
user adm: directory /var/adm does not exist
user news: directory /var/spool/news does not exist
user uucp: directory /var/spool/uucp does not exist
user gopher: directory /var/gopher does not exist
user wnn: directory /home/wnn does not exist
user gdm: directory /var/gdm does not exist
pwck: no changes
ck
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if

sendbreak -y -d 0

doesn’t work, then

reset -d 0 xir