Centos

bugs

NFS mount permission denied

Error:

[root@traderdirect ~]# mount 10.93.138.18:/nfs-shares /mounts/tdstorage/
mount: 10.93.138.18:/nfs-shares failed, reason given by server: Permission denied

Solution: /bin/mount -t nfsd nfsd /proc/fs/nfsd See: this bug report

General

Add Swap

TO add a 4 gig swap:

• dd if=/dev/zero of=/swapfile bs=1M count=4096
• mkswap /swapfile
• swapon /swapfile

Then add the following to /etc/fstab:

• /swapfile swap swap defaults 0 0

Kernel Parameters for Oralce

• Put in /etc/sysctl.conf

kernel.sem = 250 32000 100 128

net.ipv4.ip_local_port_range = 9000 - 65500
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
fs.aio-max-nr = 1048576

fs.file-max = 6815744

See more here

Changing hard & soft file limits

• Edit /etc/security/limits.conf