命令查看linux主机配置
查看cpu：
# 总核数 = 物理CPU个数 X 每颗物理CPU的核数 # 总逻辑CPU数 = 物理CPU个数 X 每颗物理CPU的核数 X 超线程数 # 查看物理CPU个数 cat /proc/cpuinfo| grep "physical id"| sort| uniq| wc -l # 查看每个物理CPU中core的个数(即核数) cat /proc/cpuinfo| grep "cpu cores"| uniq # 查看逻辑CPU的个数 cat /proc/cpuinfo| grep "processor"| wc -l # 查看CPU信息（型号） cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c
结果：
[root@10 ~]# cat /proc/cpuinfo| grep "physical id"| sort| uniq| wc -l 4 [root@10 ~]# cat /proc/cpuinfo| grep "cpu cores"| uniq cpu cores : 4 [root@10 ~]# cat /proc/cpuinfo| grep "processor"| wc -l 16 [root@10 ~]# cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c 16 Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz
查看cpu实时使用：
top
结果：
top - 09:30:33 up 90 days, 23:30, 4 users, load average: 2.08, 2.17, 3.02 Tasks: 320 total, 2 running, 318 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.1 us, 0.1 sy, 0.0 ni, 99.8 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem : 65808120 total, 12818916 free, 17110548 used, 35878656 buff/cache KiB Swap: 4063228 total, 4063132 free, 96 used. 47484696 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 11580 rocketmq 20 0 32.889g 6.817g 2.430g S 1.7 10.9 17:02.07 java 16181 elk 20 0 8615752 0.977g 18256 S 1.3 1.6 134:42.09 java 13253 rocketmq 20 0 9096544 561388 15500 S 0.3 0.9 1:24.11 java 27256 elk 20 0 11.089g 1.927g 138140 S 0.3 3.1 68:06.31 java 30954 zuul 20 0 12.753g 2.004g 14392 S 0.3 3.2 177:53.75 java 1 root 20 0 193656 6720 3908 S 0.0 0.0 4:55.84 systemd 2 root 20 0 0 0 0 S 0.0 0.0 0:02.14 kthreadd 3 root 20 0 0 0 0 S 0.0 0.0 0:02.54 ksoftirqd/0
查看内存：
cat /proc/meminfo
结果：
MemTotal: 65808120 kB MemFree: 12804772 kB MemAvailable: 47470588 kB Buffers: 132 kB Cached: 34063540 kB SwapCached: 4 kB Active: 34338292 kB Inactive: 14446612 kB Active(anon): 13535808 kB Inactive(anon): 1570584 kB Active(file): 20802484 kB Inactive(file): 12876028 kB Unevictable: 1649164 kB Mlocked: 1649164 kB SwapTotal: 4063228 kB SwapFree: 4063132 kB Dirty: 108 kB Writeback: 0 kB AnonPages: 16370448 kB Mapped: 2841072 kB Shmem: 258000 kB Slab: 1815012 kB SReclaimable: 1595996 kB SUnreclaim: 219016 kB KernelStack: 21696 kB PageTables: 68456 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 36967288 kB Committed_AS: 26694944 kB VmallocTotal: 34359738367 kB VmallocUsed: 257500 kB VmallocChunk: 34308747260 kB HardwareCorrupted: 0 kB AnonHugePages: 14931968 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 307136 kB DirectMap2M: 28004352 kB DirectMap1G: 40894464 kB
查看剩余内存：
#-m代表M单位，-g代表G单位
free -m
结果：
[root@10 ~]# free -m total used free shared buff/cache available Mem: 64265 47209 275 3250 16781 13082 Swap: 3967 944 3023
查看硬盘信息：
fdisk -l
结果：
[root@10 ~]# fdisk -l 磁盘 /dev/sda：53.7 GB, 53687091200 字节，104857600 个扇区 Units = 扇区 of 1 * 512 = 512 bytes 扇区大小(逻辑/物理)：512 字节 / 512 字节 I/O 大小(最小/最佳)：512 字节 / 512 字节 磁盘标签类型：dos 磁盘标识符：0x000d7a33 设备 Boot Start End Blocks Id System /dev/sda1 * 2048 1026047 512000 83 Linux /dev/sda2 1026048 104857599 51915776 8e Linux LVM
查看硬盘使用情况：
df -h
结果：
[root@10 ~]# df -h 文件系统 容量 已用 可用 已用% 挂载点 /dev/mapper/cl-root 36G 22G 15G 61% / devtmpfs 32G 0 32G 0% /dev tmpfs 32G 84K 32G 1% /dev/shm tmpfs 32G 3.2G 29G 11% /run tmpfs 32G 0 32G 0% /sys/fs/cgroup /dev/sda1 497M 167M 330M 34% /boot
查看磁盘io:
ulimit -a
结果：
[root@10 ~]# ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 256939 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 256939 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited
查看磁盘实时io：
iostat -x 10
结果：
[root@10 ~]# iostat -x 10 Linux 3.10.0-514.el7.x86_64 (10.1.4.34) 2018年08月31日 _x86_64_ (16 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 0.35 0.00 0.10 0.03 0.00 99.52 Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util fd0 0.00 0.00 0.00 0.00 0.00 0.00 8.00 0.00 51.00 51.00 0.00 51.00 0.00 sda 0.00 0.25 0.01 2.14 0.54 19.79 18.86 0.09 40.32 18.75 40.42 10.47 2.26 sdb 0.00 0.03 0.02 0.38 0.67 30.53 157.34 0.03 81.85 21.18 84.33 24.41 0.97 dm-0 0.00 0.00 0.01 2.33 0.53 19.21 16.86 0.10 43.52 18.65 43.62 9.45 2.21 dm-1 0.00 0.00 0.00 0.02 0.00 0.07 8.00 0.00 101.44 51.71 103.51 0.72 0.00 dm-2 0.00 0.00 0.02 0.46 0.67 31.04 133.44 0.04 81.26 21.28 83.30 21.32 1.01 dm-3 0.00 0.00 0.00 0.00 0.00 0.00 41.44 0.00 60.70 1.44 221.01 52.24 0.00 dm-4 0.00 0.00 0.00 0.00 0.00 0.00 43.26 0.00 63.92 1.49 253.16 55.01 0.00
