Generally, in order to cope with the dynamic memory address of the game, we use the base address to read the memory, but the premise is that we can know the base address. Some games, the base address is difficult to analyze, and many games are hidden and transformed, making analysis extremely complex. In this case, we can use Seraph to search for memory.
Although no base address can be found, we can easily find some direct addresses of the data we want. For example, in a game running, we can
Author: gnuhpcSource: http://www.cnblogs.com/gnuhpc/
Assume that the command is executed:
$ Echo 12000>/proc/sys/Vm/dirty_writeback_centisecs
Don't ask. You must have received the "Permission denied" prompt.
Then you try to use $ sudo echo 12000>/proc/sys/Vm/dirty_writeback_centisecs to find that it still does not work.
In fact, it is mainly because the permissions obtained by sudo do are not output wi
tcp # http Layer 7 mode option httpchk # Heartbeat detection File server db1 10.1.6.203: 3306 weight 1 check port 9222 inter 12000 rise 3 fall 3 # server definition, check inter 12000 is the heartbeat detection frequency rise 3 is 3 times correctly think the server is available, fall 3 is 3 times failed think the server is unavailable, weight stands for weight server db2 10.1.6.205: 3306 weweigh T 1 check
1. DownloadOfficial website Http://memcached.org/memcached relies on libevent-devel need to install Libevent-devel first1 Yum Install Libevent-develInstallation completed continue to install memcached1 wgethttp//memcached.org/files/memcached-1.4.35.tar.gz2 3 Tar-ZXVF memcached-1.4. *.Tar. GZ4 5CD memcached-1.4. *.Tar. GZ6 7./configure Makesudo Make InstallThe installation is successful and can be1 /usr/local/bin2 found memcached2. Start and close 1. Start the server1 Ten 127.0. 0.1
appropriate library or path.When the installation is complete, the memcached will be put into/usr/local/bin/memcached,
5. Test whether the memcached is installed successfully:# ls-al/usr/local/bin/mem*-rwxr-xr-x 1 root root 137986 11?? 17:39/usr/local/bin/memcached-rwxr-xr-x 1 root root 140179 11?? 17:39/usr/local/bin/memcached-debug
To start the memcached service :1. Start the server side of the memcache:#/usr/local/bin/memcached-d-M 10-u root-l 192.168.141.64-p
#endif再次make报错:GCC:/usr/lib64/libevent.a:no such file or directoryGCC:/usr/lib64/libm.a:no such file or directory resolves:VI MakefileFind LIBS =/usr/lib64/libevent.a/usr/lib64/libm.a this lineModify the installation path of the libevent to/USR/LOCAL/LIB/LIBEVENT.AWillCFLAGS =-wall-g-o2-i/usr/local/include $ (M64)SwitchCFLAGS =-lrt-wall-g-o2-i/usr/local/include $ (M64)Special note, if there is no lib64, you can mkdir one yourself, and then the required class library soft link to lib64ln-s/usr/li
port 9222 Inter 12000 Rise 3 Fall 3 #服务器定义, check Inter 12000 is detecting heartbeat frequency rise 3 is 3 times correctly think the server is available , Fall 3 is 3 failures that the server is not available, weight represents the weight server DB2 10.1.6.205:3306 weight 1 Check port 9222 Inter 12000 rise 3 Fall 3 list En haproxy_stats MoDE http bind 10.1.6.173
Cluster service1, the front-end PHP access to magent with the same memcache access, do not need to make any changes, for the insertion of the key,magent will be the value of the various memcache services, only operation Magent, do not care about the backend processing2, the Company Project application: North and South each 10 units front-end, north and south deploy a set of magent service, Mainly consider the network of telecom Netcom Access. In the north, for example, each front-end installati
, summary
All three of these methods are feasible.
The first method, the one that most affects the speed of the system, is not recommended for use;
The second method, the effect is good, but the same security risks exist;
The third method, personally feel that the third method is the best, recommended that everyone use
V. Using Memcache to synchronize sessions during Web clustering
I think it's best to sync the session with Memcache, and here's my setup process.
1, Analog Web cluster
I s
In general, in order to cope with the dynamic memory address of the game, we use base address to read the memory, but the prerequisite is to know the base address. Some games, base address is difficult to analyze, and a lot of games added hidden and transform, make the analysis is particularly complex. This time, with the help of Seraph, we can search for memory in another way.
Although we can't find a base address, we can easily find some direct addresses of the data we want. For example, we i
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configure or add the appropriate library or path.When the installation is complete, the memcached will be put into/usr/local/bin/memcached,
5. Test whether the memcached is installed successfully:# ls-al/usr/local/bin/mem*-rwxr-xr-x 1 root root 137986 11?? 17:39/usr/local/bin/memcached-rwxr-xr-x 1 root root 140179 11?? 17:39/usr/local/bin/memcached-debug
To start the memcached service :1. Start the server side of the memcache:#/usr/local/bin/memcached-d-M 10-u root-l 192.168.141.64-p
used.Advantage: using this method to synchronize sessions will not increase the burden on the database, and the security is much higher than using cookies. putting sessions in the memory is much faster than reading from files.Disadvantages: memcache divides the memory into multiple types of storage blocks, and the size of each block determines that memcache cannot fully utilize the memory and will generate memory fragments, if the storage block is insufficient, memory overflow occurs.
IV. Summa
five years. If the profit is 12%, it will take three times in 18 years, that is, eight times.The 115-72 rule is the doubling of computing time, while the 115 rule is the calculation of 1 to 3, that is, the doubling of time. The calculation method is the same. Using 115/X is the year when the principal is changed to three times. For example, if the income is 10%, the time for 1000 yuan to change to 3000 yuan is 115/10 = 11.5 years.72. The 115 rule is an estimation. for compound interest with a l
YJC Tricks TimeTime Limit:20 SecMemory limit:256 MBTopic Connectionhttp://acm.hdu.edu.cn/showproblem.php?pid=5276DescriptionYJC received a mysterious gift. It's a clock that grows like this.YJC is not a Time Lord so he can not make time, but this clock is too difficult to recognize! So he wanted to play with you.Now YJC gives you the angle between the hour and minute hand, so you tell him what time it is.You will give the possible time in the following format:HH:MM:SSThe hours, minutes, seconds
/memcached,
5. Test whether the memcached is installed successfully:# ls-al/usr/local/bin/mem*-rwxr-xr-x 1 root root 137986 11?? 17:39/usr/local/bin/memcached-rwxr-xr-x 1 root root 140179 11?? 17:39/usr/local/bin/memcached-debug
To start the memcached service :1. Start the server side of the memcache:#/usr/local/bin/memcached-d-M 10-u root-l 192.168.141.64-p 12000-c 256-p/tmp/memcached.pid
The-D option is to start a daemon,-M is the amount
/usr/local/bin/memcached-rwxr-xr-x 1 root root 140179 11?? 17:39/usr/local/bin/memcached-debugStart the memcached service:
1. Start the Memcache server side:
#/usr/local/bin/memcached-d-M 10-u root-l 192.168.141.64-p 12000-c 256-p/tmp/memcached.pid
The-D option is to start a daemon,-M is the amount of memory allocated to Memcache, in megabytes, I am 10MB here,-U is the user running memcache, I am here root,-L is a listening server IP address, if th
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