'LINUX'에 해당되는 글 258건

# yum install -y cpulimit

...

Error downloading packages:

  1:cpulimit-0.2-1.20151118gitf4d2682.el7.x86_64: [Errno 5] [Errno 12] Cannot allocate memory

[root@vultr-1 ~]# free -m

              total        used        free      shared  buff/cache   available

Mem:            488         339          46          28         102          98

Swap:             0           0           0

[root@vultr-1 ~]# mkdir /var/spool/swap

[root@vultr-1 ~]# dd if=/dev/zero of=/var/spool/swap/swapfile bs=1M count=512

512+0 records in

512+0 records out

536870912 bytes (537 MB) copied, 1.17655 s, 456 MB/s

[root@vultr-1 ~]# mkswap /var/spool/swap/swapfile

Setting up swapspace version 1, size = 524284 KiB

no label, UUID=82d8c6e2-eceb-4555-a2ec-8e42d62af295

[root@vultr-1 ~]# swapon /var/spool/swap/swapfile

swapon: /var/spool/swap/swapfile: insecure permissions 0644, 0600 suggested.

[root@vultr-1 ~]# free -m

              total        used        free      shared  buff/cache   available

Mem:            488         343           5          28         139          94

Swap:           511           0         511

nameserver 8.8.8.8

;nameserver 108.61.10.10

아이피주소1 특정도메인

아이피주소2 특정도메인

아이피주소3 특정도메인

# ssh-keygen

Generating public/private rsa key pair.

Enter file in which to save the key (/root/.ssh/id_rsa):

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /root/.ssh/id_rsa.

Your public key has been saved in /root/.ssh/id_rsa.pub.

The key fingerprint is:

SHA256:qFVgQxr7KJdSmg6kNfFGejV3WGZr3MCNwCZc/t3mpWw root@localhost

The key's randomart image is:

+---[RSA 2048]----+

|  . ooBo+=*o     |

|   = *o*+=o+.    |

| .+ B  oo + .    |

|o. B + o o . .   |

|o = + + S . . o .|

| o + o       + o |

|  . .         E  |

|             .   |

|                 |

+----[SHA256]-----+

# ssh-copy-id root@www.example.com

/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"

The authenticity of host 'www.example.com (133.130.111.206)' can't be established.

ECDSA key fingerprint is SHA256:/IMwZdnxDgCXr+hJAd118bqopeH+jgzb00yRDF+zjBA.

ECDSA key fingerprint is MD5:46:27:13:68:65:3d:7d:80:69:e0:ec:f3:ce:db:70:cc.

Are you sure you want to continue connecting (yes/no)? yes

/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed

/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys

root@www.example.com's password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'root@www.example.com'"

and check to make sure that only the key(s) you wanted were added.

# ssh root@www.example.com "df -h"

Filesystem      Size  Used Avail Use% Mounted on

udev            477M     0  477M   0% /dev

tmpfs           100M   11M   89M  11% /run

/dev/vda2        50G  5.0G   42G  11% /

tmpfs           497M     0  497M   0% /dev/shm

tmpfs           5.0M     0  5.0M   0% /run/lock

tmpfs           497M     0  497M   0% /sys/fs/cgroup

tmpfs           100M     0  100M   0% /run/user/0

#!/bin/bash

function random() {

  MIN=$1

  MAX=$2

  DIF=`expr $MAX - $MIN + 1`

  TIME_N=`date +%N`

  N=`expr $TIME_N % $DIF + $MIN`

  return $N

}

for I in {1..10} ; do

  random 5 10

  echo $?

done