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How to understand / etc/sysctl.conf parameters, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

Analysis of linux:/etc/sysctl.conf kernel configuration parameters: https://blog.csdn.net/mengzhisuoliu/article/details/49644533

Oracle database kernel.shmmax and kernel.sem settings: https://blog.csdn.net/hkyw000/article/details/53486940

Kernel.sem parameter setting: https://blog.csdn.net/heizistudio/article/details/72828319

Fs.file max = 999999

# indicates the maximum number of handles that a process (such as a worker process) may open at the same time, directly limiting the maximum number of concurrent connections

Net.ipv4.tcp_tw_reuse = 1

# 1 means to allow a TIME-WAIT connection in the state of socket to be reused for a new connection. It makes sense for the server because there are a large number of TIME-WAIT-state connections

Net.ipv4.tcp_keepalive_time = 600,

# how often TCP sends keepalive messages when keepalive is enabled. The default is 2 hours. Make it smaller to clear useless connections more quickly.

Net.ipv4.tcp_fin_timeout = 30

# maximum time for socket to remain in FN-WAIT-2 status when the server actively closes the link

Net.ipv4.tcp_max_tw_buckets = 5000

# the maximum number of TIME-WAIT sockets allowed. If you exceed some numbers, the TIME-WAIT socket will be cleared immediately and a warning message will be printed. The default is 180000, and too many TIME-WAIT sockets will slow down webserver

Net.ipv4.ip_local_port_range = 1024 61000

# range of values for local ports (excluding the remote end of the connection) in UDP and TCP connections

Net.ipv4.tcp_rmem = 4096 32768 262142

Net.ipv4.tcp_wmem = 4096 32768 262142

# minimum, default and maximum values of the TCP receive / send cache

Net.core.netdev_max_backlog = 8096

# when the speed of packets received by the Nic is faster than that processed by the kernel, there will be a queue to save these packets. This parameter is the maximum value of the queue.

Net.core.rmem_default = 262144

Net.core.wmem_default = 262144

# default value of kernel socket receive / send cache

Net.core.rmem_max = 2097152

Net.core.wmem_max = 2097152

# maximum value of kernel socket receive / send cache

Net.ipv4.tcp_syncookies = 1

# solve the SYN attack of TCP. Independent of performance

Net.ipv4.tcp_max_syn_backlog = 1024

# the maximum length of the SYN request queue during the establishment phase of the three-way handshake. The default is 1024. Set larger to queue requests that are too late to process when busy, without losing client requests.

Net.ipv4.tcp_timestamps=1

Net.ipv4.tcp_tw_recycle=1

Net.ipv4.ip_local_port_range = 10000 65000

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