Oracle server sysctl

本文详细介绍了 Red Hat Linux 中 sysctl 配置文件的各项参数设置,包括 IP 数据包转发、源路由验证、核心转储文件名管理、TCP 同步饼干等功能配置,以及消息和共享内存的最大限制等。

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# 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 = 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


kernel.panic = 2
kernel.panic_on_oops = 1

fs.aio-max-nr = 1048576
kernel.shmmni = 32768
kernel.sem = 250 32000 100 128
fs.file-max = 6815744
net.ipv4.ip_local_port_range = 9000 65500

net.core.rmem_default = 8388608
net.core.rmem_max = 33554432
net.core.wmem_default = 8388608
net.core.wmem_max = 33554432

net.ipv4.tcp_rmem = 524288 2097152 33554432
net.ipv4.tcp_wmem = 524288 2097152 33554432
net.ipv4.tcp_mem = 1048576 4194304 67108864
net.core.netdev_max_backlog = 30000


#default 15
net.ipv4.tcp_retries2=7
#default 1
net.ipv4.tcp_sack=0
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