压缩:
例如: 将wwwroot目录,全部压缩成一个名为20180816backup的备份文件
zip -r 20180816backup.zip wwwroot
查看内存使用情况:
free -mh
[root@vwhm.net]# free -mh
total used free shared buff/cache available
Mem: 992M 714M 85M 66M 192M 69M
Swap: 0B 0B 0B
释放内存
echo 1 > /proc/sys/vm/drop_caches
[root@vwhm.net]# echo 1 > /proc/sys/vm/drop_caches
[root@vwhm.net]# free -mh
total used free shared buff/cache available
Mem: 992M 714M 149M 66M 127M 102M
Swap: 0B 0B 0B
查看端口
netstat
[root@vwhm.net ~][ # netstat
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 localhost:48818 localhost:mysql TIME_WAIT
tcp 0 0 izj6c90yicge6f4tqn:http 59.63.216.224:15947 ESTABLISHED
tcp 0 36 izj6c90yicge6f4tqnc:ssh 59.63.216.224:6018 ESTABLISHED
tcp 0 0 localhost:cslistener localhost:48668 TIME_WAIT
tcp 0 0 izj6c90yicge6f4tqnc:ssh 59.63.216.224:5530 ESTABLISHED
tcp 0 0 izj6c90yicge6f4tq:39904 106.11.228.229:http ESTABLISHED
Active UNIX domain sockets (w/o servers)
Proto RefCnt Flags Type State I-Node Path
unix 2 [ ] DGRAM 9622 /run/systemd/shutdownd
unix 2 [ ] DGRAM 6872 /run/systemd/notify
unix 2 [ ] DGRAM 6874 /run/systemd/cgroups-agent
unix 5 [ ] DGRAM 6891 /run/systemd/journal/socket
unix 9 [ ] DGRAM 6893 /dev/log
unix 3 [ ] STREAM CONNECTED 14631 /run/systemd/journal/stdout
读内核信息,并解释
cat /proc/meminfo
[root@vwhm.net ~]# cat /proc/meminfo
MemTotal: 1016168 kB
MemFree: 114820 kB
MemAvailable: 82532 kB
Buffers: 7852 kB
Cached: 122732 kB
SwapCached: 0 kB
Active: 734324 kB
Inactive: 87228 kB
Active(anon): 726436 kB
Inactive(anon): 32376 kB
Active(file): 7888 kB
Inactive(file): 54852 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 691016 kB
Mapped: 68676 kB
Shmem: 67828 kB
Slab: 33380 kB
SReclaimable: 15632 kB
SUnreclaim: 17748 kB
KernelStack: 2592 kB
PageTables: 25068 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 508084 kB
Committed_AS: 1733276 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 8804 kB
VmallocChunk: 34359719676 kB
HardwareCorrupted: 0 kB
AnonHugePages: 96256 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 53120 kB
DirectMap2M: 995328 kB
DirectMap1G: 0 kB
MemTotal: 1016168 kB #所有可用RAM大小 （即物理内存减去一些预留位和内核的二进制代码大小）
MemFree: 114820 kB #LowFree与HighFree的总和，被系统留着未使用的内存
Buffers: 7852 kB #用来给文件做缓冲大小
Cached: 122732 kB #被高速缓冲存储器（cache memory）用的内存的大小(等于 diskcache minus SwapCache)
SwapCached: 0 kB #被高速缓冲存储器（cache memory）用的交换空间的大小 已经被交换出来的内存，但仍然被存放在swapfile中。用来在需要的时候很快的被替换而不需要再次打开I/O端口。
Active: 734324 kB #在活跃使用中的缓冲或高速缓冲存储器页面文件的大小，除非非常必要否则不会被移作他用.
Inactive: 87228 kB #在不经常使用中的缓冲或高速缓冲存储器页面文件的大小，可能被用于其他途径.
查看内存条数
dmidecode |grep -A16 “Memory Device$”
[root@vwhm.net ~]# dmidecode |grep -A16 "Memory Device$"
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: DIMM 0
Bank Locator: Not Specified
Type: RAM
Type Detail: Other
Speed: Unknown
Manufacturer: Alibaba Cloud
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified