sysctl.conf

# 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

# 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

# Controls the maximum size of a message, in bytes
kernel.msgmnb = 65536

# Controls the default maxmimum size of a mesage queue
kernel.msgmax = 65536

# Controls the maximum shared segment size, in bytes
kernel.shmmax = 68719476736

# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 4294967296
net.ipv4.neigh.default.gc_thresh3 = 10240
net.ipv4.tcp_syn_retries = 2
kernel.core_pattern = /home/s/coredump/%e.%p.core
net.ipv4.neigh.default.gc_thresh1 = 1280
net.core.netdev_max_backlog = 300000
vm.swappiness = 60
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_max_tw_buckets = 300000
kernel.exec-shield = 1
net.core.somaxconn = 262144
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_keepalive_time = 300
vm.dirty_ratio = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_wmem = 32768 436600 4194304
net.ipv4.tcp_mem = 1000000 1001024 1002048
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_fin_timeout = 10
fs.file-max = 999999
kernel.randomize_va_space = 1
net.ipv4.neigh.default.gc_thresh2 = 5120
net.ipv4.tcp_rmem = 32768 436600 4194304