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  • ceph 基本查询命令

    查看pool

    [root@node1 ~]# ceph osd lspools
    1 .rgw.root
    2 default.rgw.control
    3 default.rgw.meta
    4 default.rgw.log
    5 default.rgw.buckets.index
    6 default.rgw.buckets.data
    7 default.rgw.buckets.non-ec
    

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  • 设置SElinux

    SElinux工具

    setsebool命令是用来修改SElinux策略内各项规则的布尔值。
    setsebool命令和getsebool命令是SELinux修改和查询布尔值的一套工具组。
    SELinux的策略与规则管理相关命令:seinfo命令、sesearch命令、getsebool命令、setsebool命令、semanage命令。

    getsebool

    getsebool -a #query all
    

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  • Base64

    Base64

    所谓Base64,就是说选出64个字符—-小写字母a-z、大写字母A-Z、数字0-9、符号”+”、”/”(再加上作为垫字的”=”,实际上是65个字符)—-作为一个基本字符集。然后,其他所有符号都转换成这个字符集中的字符。
    Base64将三个字节转化成四个字节,因此Base64编码后的文本,会比原文本大出三分之一左右。

    Base64 Table

    Index Char Index Char Index Char Index Char
    0 A 16 Q 32 g 48 w
    1 B 17 R 33 h 49 x
    2 C 18 S 34 i 50 y
    3 D 19 T 35 j 51 z
    4 E 20 U 36 k 52 0
    5 F 21 V 37 l 53 1
    6 G 22 W 38 m 54 2
    7 H 23 X 39 n 55 3
    8 I 24 Y 40 o 56 4
    9 J 25 Z 41 p 57 5
    10 K 26 a 42 q 58 6
    11 L 27 b 43 r 59 7
    12 M 28 c 44 s 60 8
    13 N 29 d 45 t 61 9
    14 O 30 e 46 u 62 +
    15 P 31 f 47 v 63 /

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  • 见与不见

    /*
    你爱或者不爱我
    爱就在那里
    不增不减
    */
    while( you.love(me) || !you.love(me) ){
        me.emotion.love.value++;
        me.emotion.love.value--;
    }
    
                                **--苍央嘉措**
    
  • file deduplication

    File system-based deduplication

    File system-based deduplication is a simple method to reduce duplicate data at the file level, and usually is just a compare operation within the file system or a file system-based algorithm that eliminates duplicates.

    An example of this method is comparing the name, size, type and date-modified information of two files with the same name being stored in a system.

    If these parameters match, you can be pretty sure that the files are copies of each other and that you can delete one of them with no problems. Although this example isn’t a foolproof method of proper data deduplication, it can be done with any operating system and can be scripted to automate the process, and best of all, it’s free.

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