一、linux版本及内核

#查看发行版本
cat /etc/redhat-release

#查看内核版本
 cat /proc/version

#机器型号
/usr/sbin/dmidecode

二、cpu

#型号

cat /proc/cpuinfo | grep 'model name'| uniq


#物理cpu个数

cat /proc/cpuinfo| grep "physical id"| sort| uniq| wc -l


#每个物理CPU中core的个数(即核数)

cat /proc/cpuinfo| grep "cpu cores"| uniq


#逻辑核心数

cat /proc/cpuinfo| grep "process"| wc -l

三、内存

#查看内存大小

free -g

四、磁盘

#连续写速度
time dd if=/dev/zero of=/1Gb.file bs=1024 count=1000000
正常值：sas>200M/s、ssd>400M/s，仅针对raid5

#连续读速度
time dd if=/1Gb.file of=/dev/zero bs=1024

#读速度
hdparm -Tt /dev/sda
/dev/sda:
 Timing cached reads:   18208 MB in  2.00 seconds = 9119.31 MB/sec【缓存读取】
 Timing buffered disk reads: 1590 MB in  3.00 seconds = 529.99 MB/sec【物理读取】
正常值：sas>300M/s、ssd>1000M/s，仅针对raid5

#当前读写速递
iostat -d 1 3

#规划检查
df -h
/dev/sda2        32G  3.5G   27G  12% /
tmpfs           127G   12K  127G   1% /dev/shm
/dev/sda1       488M   51M  402M  12% /boot
/dev/sda7       1.2T   30G  1.1T   3% /data
/dev/sda3        32G   17G   14G  55% /usr
/dev/sda5        32G  394M   30G   2% /var

五、网络

#配置路径

cat /etc/sysctl.conf

修改配置后执行sysctl -p立即生效

我们WebServer实体机配置如下：
# 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 = 1

# 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 default maxmimum size of a mesage queue
kernel.msgmnb = 65536

# Controls the maximum size of a message, in bytes
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.netfilter.nf_conntrack_max = 6553600
net.netfilter.nf_conntrack_tcp_timeout_established = 120
#net.ipv4.netfilter.ip_conntrack_max = 655360
#net.ipv4.netfilter.ip_conntrack_tcp_timeout_established = 180
net.ipv4.ip_local_port_range = 1025 65535
net.ipv4.tcp_max_syn_backlog = 2621440
net.ipv4.tcp_max_tw_buckets = 8000
#net.core.somaxconn = 262144
net.core.somaxconn = 65535
net.core.netdev_max_backlog = 2621440
net.core.rmem_default = 33554432
net.core.wmem_default = 33554432
net.core.rmem_max = 33554432
net.core.wmem_max = 33554432
net.ipv4.tcp_rmem = 4096 87380 33554432
net.ipv4.tcp_wmem = 4096 87380 33554432
net.ipv4.tcp_mem = 94500000 915000000 927000000
#net.ipv4.conf.em1.arp_ignore = 1
#net.ipv4.conf.em1.arp_announce = 2
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.ip_forward = 1
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_keepalive_time = 60

六、进程

#用户进程数量限制配置

cat /etc/security/limits.d/90-nproc.conf


#查看当前用户可用最大进程量

ulimit -u


#查看指定用户可用最大进程量

su -l solr -s /bin/bash -c 'ulimit -a'

看如下的两个参数配置

open files                      (-n) 102400

max user processes              (-u) 102400

七、防火墙

#查看防火墙是否启动

service iptables status


#查强制访问控制

/usr/sbin/sestatus -v

SELINUX值=disabled

#修改位置

cat /etc/sysconfig/selinux

八、hostname

#查看hostname

hostname

九、遇到过的问题