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compile net-snmp on debian lenny

[不指定 2009/09/23 16:16 | by askwan ]
net-snmp
下载地址：http://ncu.dl.sourceforge.net/project/net-snmp/net-snmp/5.4.2.1/net-snmp-5.4.2.1.tar.gz
解压然后编译，编译参数
./configure --prefix=/usr/local/net-snmp/ --with-sys-contact="askwan@askwan.com" --with-sys-location="pudong shanghai China" --enable-shared --with-default-snmp-version=2 --enable-mfd-rewrites --with-mib-modules="misc/ipfwacc mibII host disman/event-mib ucd_snmp agent_mibs agentx notification target utilities ucd-snmp/diskio tunnel mibII/mta_sendmail" --with-sysconfdir="/usr/local/net-snmp/etc/"

如编译报错：
Quotation
/usr/bin/ld: cannot find -lperl
collect2: ld returned 1 exit status

这是缺少libperl-dev开发库,安装上
apt-get install libperl-dev

然后make ;make install
可以用snmpconf配置snmpd.conf，也可用例子文件
cp  EXAMPLE.conf /usr/local/net-snmp/etc/snmpd.conf

然后根据需要修改此文件
com2sec local     localhost       askwan
com2sec mynetwork 192.168.0.0/24      askwan

group MyRWGroup v1         local
group MyRWGroup v2c        local
group MyRWGroup usm        local
group MyROGroup v1         mynetwork
group MyROGroup v2c        mynetwork
group MyROGroup usm        mynetwork

view all    included  .1                               80
access MyROGroup ""      any       noauth    exact  all    none   none
access MyRWGroup ""      any       noauth    exact  all    all    none

syslocation shanghai pu dong
syscontact Me askwan@askwan.com

启动
/usr/local/net-snmp/sbin/snmpd -Lsd -Lf /dev/null -p /var/run/snmpd.pid -a -c /usr/local/net-snmp/etc/snmpd.conf


测试
snmpwalk -c askwan -v2c 192.168.0.5 if

Quotation
IF-MIB::ifIndex.1 = INTEGER: 1
IF-MIB::ifIndex.2 = INTEGER: 2
IF-MIB::ifDescr.1 = STRING: lo
IF-MIB::ifDescr.2 = STRING: eth0
IF-MIB::ifType.1 = INTEGER: softwareLoopback(24)
IF-MIB::ifType.2 = INTEGER: ethernetCsmacd(6)
....


---------END------------
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oracle temporary tablespace boom unexpectedly

[不指定 2009/09/07 08:38 | by askwan ]
临时表空间用途：
INDEX CREATE ,INDEX REBUILD,ORDER BY ,GROUP BY, DISTINCT,Analyze,UNION, Sort-Merge etc..
上面这些操作均会用到临时表空间

临时表空间重建步骤：
比如临时表空间一直增大，导致系统磁盘空间吃紧，考虑重建
1 定位当前临时表空间位置
Quotation
SQL> SELECT FILE_NAME,TABLESPACE_NAME FROM DBA_TEMP_FILES;

FILE_NAME                                                                        TABLESPACE_NAME
-------------------------------------------------------------------------------- ------------------------------
/u01/oracle/oradata/askwan/temp01.dbf                                            TEMP


2 创建临时表空间TEMP02
Quotation
SQL> CREATE TEMPORARY TABLESPACE TEMP02 TEMPFILE '/u01/oracle/oradata/askwan/temp02.dbf'
SIZE 100M REUSE AUTOEXTEND ON NEXT 512K MAXSIZE UNLIMITED;

Tablespace created


review:
Quotation
SQL>  SELECT FILE_NAME,TABLESPACE_NAME FROM DBA_TEMP_FILES;

FILE_NAME                                                                        TABLESPACE_NAME
-------------------------------------------------------------------------------- ------------------------------
/u01/oracle/oradata/askwan/temp01.dbf                                            TEMP
/u01/oracle/oradata/askwan/temp02.dbf                                            TEMP02

have created successfull.


3 改变缺省临时表空间为TEMP02
Quotation
SQL> ALTER DATABASE DEFAULT TEMPORARY TABLESPACE TEMP02;

Database altered


4 .删除原缺省表空间temp
Quotation
SQL> drop tablespace temp including contents and datafiles;

Tablespace dropped


5.创建新表空间temp
Quotation
SQL> CREATE TEMPORARY TABLESPACE TEMP TEMPFILE '/u01/oracle/oradata/askwan/temp.dbf'
SIZE 100M REUSE AUTOEXTEND ON NEXT 512K MAXSIZE UNLIMITED;

Tablespace created


6. 改变缺省表空间
Quotation
SQL> alter database default temporary tablespace temp;

Database altered


7.删除中间过程表空间TEMP02
Quotation
SQL> drop tablespace temp02 including contents and datafiles;

Tablespace dropped


8.重新指定用户临时表空间
Quotation
SQL> alter user ASKWAN temporary tablespace temp;

User altered


涉及临时文件相关操作
eg.
alter database tempfile '/u01/oracle/oradata/askwan/temp.dbf'  autoextend off;
alter database tempfile '/u01/oracle/oradata/askwan/temp.dbf'  resize 300M;
alter database tempfile ''/u01/oracle/oradata/askwan/temp.dbf' autoextend on;
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linux的内核漏洞

[不指定 2009/08/22 07:39 | by askwan ]
“Linux Kernel 'sock_sendpage()' NULL Pointer Dereference Vulnerability”  

标准化代号 CVE-2009-2692

这漏洞恐怕是linux历史上非常值得“怀念”的了
如今exploit工具早已发布出来 还是有不少人没有引起重视啊
我安装的几台debian lenny 5.0.1和几台RHEL5.3也不幸名列其中 加上我自己的Ubuntu9.04
几乎可以说是全部“中招”了 呵呵

受影响linux系统列表

在各种solutions也都公布出来的今天
我想我们应该只关心两个问题
1.你管理的linux服务器在这个列表中吗 ？
2.你已经采取了补救措施了吗？

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