服务器的负载能力很大程度上取决于系统管理员的配置和优化能力相同的硬件不同的软件配置会造成截然不同的效果下面我将给大家介绍一下如何优化 sysctrl Apache 以及 MySQL 请注意所有配置均为取决于个人请根据自己的实际情况做调整
配置Sysctl
编辑此文件
nano w /etc/nf
如果该文件为空则输入以下内容否则请根据情况自己做调整
# Controls source route verification
# Default should work for all interfaces
nfdefaultrp_filter =
# nfallrp_filter =
# nflorp_filter =
# nfethrp_filter =
# Disables IP source routing
# Default should work for all interfaces
nfdefaultaccept_source_route =
# nfallaccept_source_route =
# nfloaccept_source_route =
# nfethaccept_source_route =
# Controls the System Request debugging functionality of the kernel
kernelsysrq =
# Controls whether core dumps will append the PID to the core filename
# Useful for debugging multithreaded applications
re_uses_pid =
# Increase maximum amount of memory allocated to shm
# Only uncomment if needed!
# kernelshmmax =
# Disable ICMP Redirect Acceptance
# Default should work for all interfaces
nfdefaultaccept_redirects =
# nfallaccept_redirects =
# nfloaccept_redirects =
# nfethaccept_redirects =
# Enable Log Spoofed Packets Source Routed Packets Redirect Packets
# Default should work for all interfaces
nfdefaultlog_martians =
# nfalllog_martians =
# nflolog_martians =
# nfethlog_martians =
# Decrease the time default value for tcp_fin_timeout connection
netipvtcp_fin_timeout =
# Decrease the time default value for tcp_keepalive_time connection
netipvtcp_keepalive_time =
# Turn on the tcp_window_scaling
netipvtcp_window_scaling =
# Turn on the tcp_sack
netipvtcp_sack =
# tcp_fack should be on because of sack
netipvtcp_fack =
# Turn on the tcp_timestamps
netipvtcp_timestamps =
# Enable TCP SYN Cookie Protection
netipvtcp_syncookies =
# Enable ignoring broadcasts request
netipvicmp_echo_ignore_broadcasts =
# Enable bad error message Protection
netipvicmp_ignore_bogus_error_responses =
# Make more local ports available
# netipvip_local_port_range =
# Set TCP ReOrdering value in kernel to ′
netipvtcp_reordering =
# Lower syn retry rates
netipvtcp_synack_retries =
netipvtcp_syn_retries =
# Set Max SYN Backlog to ′
netipvtcp_max_syn_backlog =
# Various Settings
dev_max_backlog =
# Increase the maximum number of skbheads to be cached
rehot_list_length =
# Increase the tcptimewait buckets pool size
netipvtcp_max_tw_buckets =
# This will increase the amount of memory available for socket input/output queues
rermem_default =
rermem_max =
netipvtcp_rmem =
rewmem_default =
rewmem_max =
netipvtcp_wmem =
netipvtcp_mem =
reoptmem_max =
如果希望屏蔽别人 ping 你的主机则加入以下代码
# Disable ping requests
netipvicmp_echo_ignore_all =
编辑完成后请执行以下命令使变动立即生效
/sbin/sysctl p
/sbin/sysctl w netipvrouteflush=
MySQL优化
编辑MySQL的配置文件
nano /etc/f
输入以下内容
[mysqld]
connect_timeout=
interactive_timeout=
join_buffer_size=M
key_buffer=M
max_allowed_packet=M
max_connections=
max_connect_errors=
myisam_sort_buffer_size=M
read_buffer_size=M
read_rnd_buffer_size=K
sort_buffer_size=M
table_cache=
thread_cache_size=
thread_concurrency=
wait_timeout=
query_cache_size=M
query_cache_limit=M
query_cache_type=
skipinnodb
请注意以上配置适用于M~M内存如内存更大的话请自行做调整给项目增加内存会加快速度但是使用过多的内存而导致启用swap的话会极大的导致系统效率下降其中 thread_concurrency 这项配置单CPU的话请设置为双CPU的话请设置为
Apache优化
以下优化适用于 Apache 系列如果你用的是 系列的话请自行做调整和判断
确认 Apache 的配置文件位置并开始编辑
locate
nano w /path/to/
的文件有许多内容笔者就拿出需要做优化的
KeepAlive On
MaxKeepAliveRequests
KeepAliveTimeout
MinSpareServers
MaxSpareServers
MaxRequestsPerChild
将 KeepAliveTimeout 设定到较小的数字将有助于减少服务器上的无用等待链接一定程度上能增加服务器负载
另外下面这条不算优化但是是Apache安全相关
ServerSignature Off
ServerTokens ProductOnly
将 ServerSignature 关闭并增加 ServerTokens ProductOnly 可以使常人无法检测到Apache的实际版本号有助于Apache的安全
以上所做的这些优化在某种程度上会增强服务器的负载性能但请注意最佳的配置是实践出来的
