2008年6月22日
#
rsync -avz -e ssh bak@192.168.0.138:/home/res /home/res/bak
1. 使用Replication进行实时备份
参考mysql docs
2. 定期在slave上使用shell,mysqldump,sftp,crontab进行永久备份
#!/bin/sh
export d=`date +%Y%m%d%H%M%S`
mkdir -p /data/dbbak/baktables/$d
for i in `echo "show tables" | mysql -u bak -ppassword db|grep -v Tables`;
do
echo $i; mysqldump --add-drop-table --allow-keywords -q -a -c -u bak -ppasswod mbook_hd $i > backup/$d/$i.sql
done
tar czf backup/$d.tar.gz backup/$d/
rm -rf backup/$d/
lftp -e "cd /dbbak/; mput -c $d.tar.gz; quit" -u bak,password sftp://192.168.0.138
参考http://ocaoimh.ie/simple-mysql-backup/
10G级别的可以每天作一次备份，100G级别看带宽和硬盘，T级没有经验
#!/usr/bin/env python
import string, os, sys
dir = '/home/waterye/works/'
files = os.listdir(dir)
for f in files:
if not os.path.isfile(dir+os.sep+f): continue
linecount = 0
fp = open(dir+os.sep+f,'r')
for line in fp:
linecount += 1
fp = open(dir+os.sep+f,'r')
for i,line in enumerate(fp):
if (i==linecount-1 and line.endswith('\n')):
print f
print "--------------------------------"
* bash太难理解，还是用py看上去舒服，虽然不专业，但能完成任务就行
"perldoc DateTime" would have told you how to format milliseconds.
use DateTime;
use Time::HiRes qw(time);
my $dt = DateTime->from_epoch( epoch => time() );
print $dt->strftime('%Y-%m-%d %H-%M-%S-%3N'), "\n";
* sudo apt-get install libdatetime-perl
perl真麻烦
1. http://www.whalin.com/memcached/ v2.0.1
2. http://code.google.com/p/spymemcached/ v2.2
a. 使用whalin版会导致File Descriptor leak,而使用spy版则不会，原因是whalin版没有使用selector管理socketchannel.
Thread.sleep(1000 * 30);
System.out.println("begin
");
Selector selector = null;
SocketChannel channel = null;
try {
String host = "192.168.0.74";
int port = 11211;
int timeout = 1000 * 60;
selector = Selector.open();
channel = SocketChannel.open();
channel.configureBlocking(false);
channel.connect(new InetSocketAddress(host, port));
channel.register(selector, channel.validOps());
try {
selector.select();
} catch (IOException e) {
e.printStackTrace();
}
Iterator it = selector.selectedKeys().iterator();
int i = 0;
while (it.hasNext()) {
i++;
System.out.println(i);
SelectionKey selKey = (SelectionKey) it.next();
it.remove();
try {
processSelectionKey(selKey);
} catch (IOException e) {
e.printStackTrace();
selKey.cancel();
}
}
System.out.println("unclose");
Thread.sleep(1000 * 30);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (channel != null && channel.isOpen()) {
try {
channel.close();
} catch (Exception e) {
e.printStackTrace();
}
}
if (selector!=null) {
selector.close(); // not fd leak
}
}
System.out.println("end");
Thread.sleep(1000 * 30 * 1);
通过lsof -p pid | grep pipe可以观察是否有fd leak.
b. w版set 1000000 object 需要600s左右，s版只需150s左右
192.168.0.74 [root avi]$ python /root/memcached/cacti-memcached-1.0/memcached.py localhost
total_items:2002344 get_hits:3 uptime:50291 cmd_get:3 time:1224521129 bytes:58888890 curr_connections:1 connection_structures:8 bytes_written:16167008 limit_maxbytes:402653184 cmd_set:2002344 curr_items:1000000 rusage_user:101.730357 get_misses:0 rusage_system:199.092442 bytes_read:63849044 total_connections:314
1. iftop
sudo apt-get install iftop
sudo iftop -i ppp0
2. slurm
sudo apt-get install slurm
slurm -i ppp0
3. vnstat
sudo apt-get install vnstat
sudo chmod o+x /usr/bin/vnstat
sudo chmod o+wx /var/lib/vnstat/
vnstat -u -i ppp0
vnstat -i ppp0
vnstat -l -i ppp0
因为不是server就没有用复杂的mrtg
vi,gedit会在最后一行加上\n,实在找不到好的解决方法,只好自己写个shell script删掉
#!/usr/bin/env python
import sys
oldfile=sys.argv[1]
newfile=sys.argv[2]
print oldfile,newfile,
print
linecount = 0
str = ''
f = open(oldfile,'r')
for line in f:
linecount += 1
f = open(oldfile,'r')
for i,line in enumerate(f):
if (i==linecount-1):
str += line.replace('\n','')
# print line.replace('\n','')
else:
str += line
# print line,
#print len(str),str
f2 = open(newfile, 'w')
f2.write(str)
quit()
free -lmt
cat /proc/meminfo
dmesg |grep [mM][eE][mM]
cat /proc/pid/status
1. find . -type f -exec rm -v {} \;
2. nice -n 19 rm -rf directory
3. ls | xargs rm
4. find . -mtime +90 -type f -exec rm -v {} \;
采用第四种最好，把一些旧的文件先删除
shell
mysql -h 192.168.0.136 -P 3306 -N -u root -p'abcd' -e 'show full processlist' | egrep -v 'Sleep|show full processlist'
jsp
String sql = " show full processlist ";
rs = stmt.executeQuery(sql);
while (rs.next()) {
String id = rs.getString("Id");
String user = rs.getString("User");
String host = rs.getString("Host");
String db = rs.getString("db");
String command = rs.getString("Command");
String info = rs.getString("Info");
String state = rs.getString("State");
if (command.equalsIgnoreCase("Sleep")) continue;
if (info.equalsIgnoreCase("show full processlist")) continue;
if (info.length()==0 && state.length()==0) continue;
int time = rs.getInt("Time");
// print
}
nbtstat.exe -a 192.168.0.171
nbtscan-1.0.35.exe -f 192.168.0.1/24
http://www.unixwiz.net/tools/nbtscan.html
在/root/.bashrc增加一行
export PS1="\[ \033[0;32;40m\u@\h:\w\$ \033[0m \]"
---------------------------------------------------------------------
首先使用一个例子来说明如何实现Shell彩色：
PS1="\[ \033[0;32;40m\u@\h:\w\$ \033[0m \]"
在上面命令中，“\033[0;32;40m”表示定义后面文本的颜色，“\033”表示启动一个转义序列，“[”定义开始颜色定义，“0”定义默认的字体颜色，其它部分稍后定义。
“32”定义文本的前景色，这里32表示绿色；“40”定义文本的背景色，40表示黑色。
在字符串的最后定义了“ \033[0m”，它是用来恢复了默认的文本颜色设置，这样就只会得到一个彩色提示符，而不会影响命令和其输出的颜色显示（即黑底白字）。
我们一共有8种字体颜色可供选择，它们分别是30 (黑色)、31 (红色)、32 (绿色)、33 (黄色)、34 (蓝色)、35 ( 紫红色)、36 (青色)和37 (白色)。
对于底色也有8种颜色可供选择，只需要将字体颜色的3修改为4即可，例如40、41、42、43、44、45、46、47。
文本属性
我们前面提到，转义序列符后面的“0”表示定义文本的颜色设置。
除了颜色设置以外，还可以设置文本的其它属性。
转义序列符后可以跟以下数值：0、1、22、4、24、5、25、7、27，分别定义颜色、黑体、非黑体、下画线、非下画线、闪烁、非闪烁、翻转、非翻转。
出处: http://www.cppblog.com/Bugs/archive/2008/06/24/54442.html
CustomLog "|/usr/local/apache2/bin/rotatelogs /usr/local/apache2/logs/access.log.%Y.%m.%d 86400 480" common # one day per file
java.awt.image.BufferedImage bufi = javax.imageio.ImageIO.read(bais);
javax.imageio.ImageIO.write(bufi, "jpg", baos);
check_mysql!-H 192.168.0.88 -P 3308 -u check -p checkpwd
check_mysql!-H 192.168.0.99 -P 3308 -u check -p checkpwd -S ; check mysql slave server
check_mysql_query!-H 192.168.0.99 -P 3308 -u check -p checkpwd -q "select count(*) from table_name" -w 100 -c 200
check_http!-p 8080
check_http!-u http://192.168.0.188:8080/a.jsp
/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/sda1
/usr/local/nagios/libexec/check_users -w 5 -c 10
/usr/local/nagios/libexec/check_procs -w 150 -c 200
/usr/local/nagios/libexec/check_procs -a 'instance_name=app.task' -c 1:1
/usr/local/nagios/libexec/check_mrtgtraf -F /home/mrtg/logs/192.168.0.188_1.log -a AVG -w 1000000,2000000 -c 5000000,5000000 -e 10
Map<String, Integer> m = new TreeMap<String, Integer>();
m.put(key, value);
Set<Map.Entry<String, Integer>> treeSet = new TreeSet<Map.Entry<String, Integer>>(
new Comparator<Map.Entry<String, Integer>>() {
public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
Integer d1 = o1.getValue();
Integer d2 = o2.getValue();
int r = d2.compareTo(d1);
if (r!=0) return r;
else return o2.getKey().compareTo(o1.getKey());
}
});
treeSet.addAll(m.entrySet());
for (Map.Entry me : treeSet) {
System.out.println(me.getKey() + "," + me.getValue());
}
awk '{ if (index($4,"ip")>0) { split($4,a,","); if (substr(a[2],11)>0) print substr(a[2],11) } }' access.log.txt.2008-07-26 > ip.20080726.log
awk '{a[$0]++}END{for(i in a){print a[i] " " i}}' ip.20080726.log | sort -rn | head -n 300
awk '{a[$0]++}END{for(i in a){ j++;} } END { print j }' ip.20080726.log
The GNU Awk User's Guide
:%s/oldstr/newstr/g 替换所有
:$ 跳到文件最后一行
yy命令复制当前整行的内容到vi缓冲区
粘贴缓冲区中的内容，用p