Nagios Support Forum

After Applying Configuration, Active Host checks , Active Service checks and Notifications remain disabled for at least 5 or 6 Minutes. Is this normal operation for the 32 bit version of Nagios XI? I am currently running the 32 bit VM with 506 active hosts so far and 1,515 Services. I am planning to enter at least 500 more hosts and 5000 more Services.

What version of Nagios XI are you running?
What are your hardware specs (HDD, CPU, RAM)? Did you follow our general guidelines on the hardware requirements needed to run Nagios XI?
Can you show what you have in the "/etc/php.ini" under the "Resource Limits" section?

We are running Nagios XI 2011R3.1.

Hardware Specs
CPU= 2 Virtual Sockets and 1 Core each Socket
Memory = 4096 MB
HDD = 10 GB

Utilizing precanned Nagios XI VM running on Centos 6.

Contents of the php.ini file are located in attachment.

I think I know the problem, there was a bug in 3.x releases with a fix outlined here
http://support.nagios.com/wiki/index.ph ... 3.x_Issues

Am I to replace the contents of the sysctl.conf file or make the addition of the other entries?
Here is my current sysctl.conf file:
# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls IP packet forwarding
net.ipv4.ip_forward = 0

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1

# Controls the use of TCP syncookies
net.ipv4.tcp_syncookies = 1

# Disable netfilter on bridges.
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0

If I am thinking right I would just make the addition of the other entries as follows:
# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls IP packet forwarding
net.ipv4.ip_forward = 0

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1

# Controls the use of TCP syncookies
net.ipv4.tcp_syncookies = 1

# Disable netfilter on bridges.
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0

# Controls the maximum size of a message, in bytes
kernel.msgmnb = 131072000

# Controls the default maxmimum size of a mesage queue
kernel.msgmax = 131072000

# Controls the maximum shared segment size, in bytes
kernel.shmmax = 4294967295

# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 268435456

after which I would run sysctl -p

Is this correct?

Yes, make these additions, run:
then reboot your server.

Let us know how it went.

Wow. Much better! Thank you for your assistance on this.

Glad we could help!