#模拟他的场景，防火墙关闭，SELinux关闭安装Apache服务[root@localhost /]# yum -y install httpd    #yum安装Apache服务[root@localhost /]# service httpd restart   #重启apache服务[root@localhost /]# grep -i   "^#Cu" /etc/httpd/conf/httpd.conf#CustomLog logs/access_log common#CustomLog logs/referer_log referer#CustomLog logs/agent_log agent#CustomLog logs/referer_log referer#CustomLog logs/agent_log agent[root@localhost /]# sed -i   "s@#CustomLog logs/access_log common@CustomLog /app/logs/access_log common@g"   /etc/httpd/conf/httpd.conf    #修改一下日志的存放路径[root@localhost /]# grep -i "^#Cu" /etc/httpd/conf/httpd.conf           #CustomLog /app/logs/access_log common#CustomLog logs/referer_log referer#CustomLog logs/agent_log agent 模拟创建一个小磁盘[root@localhost /]# dd if\=/dev/mapper/VolGroup-lv_root of\=/dev/sdb1   bs\=8k count\=10 10+0 records in10+0 records out81920 bytes (82 kB) copied, 0.000201325   s, 407 MB/s#dd模拟创建一个磁盘，if输入，of输出，bs：blocks大小，count：block的数量 [root@localhost /]# mkfs.ext4 /dev/sdb1   #格式化分区mke2fs 1.41.12 (17-May-2010)/dev/sdb1 is not a block special device.Proceed anyway? (y,n) yFilesystem label=OS type: LinuxBlock size=1024 (log=0)Fragment size=1024 (log=0)Stride=0 blocks, Stripe width=0 blocks16 inodes, 80 blocks4 blocks (5.00%) reserved for the super   userFirst data block=11 block group8192 blocks per group, 8192 fragments per   group16 inodes per group Writing inode tables: done                            Filesystem too small for a journalWriting superblocks and filesystem   accounting information: done This filesystem will be automatically   checked every 28 mounts or180 days, whichever comes first.  Use tune2fs -c or -i to override. #挂载分区[root@localhost /]# mkdir -p /app/logs/[root@localhost /]# mount /dev/sdb1 /app/logs/      #这样挂载不成功，需要特使挂载，方法在下mount: /dev/sdb1 is not a block device (maybe try `-o loop'?)[root@localhost /]# mount -o loop /dev/sdb1 /app/logs/[root@localhost /]# df -ThFilesystem                   Type   Size    Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root ext4    18G    990M   16G   6% /tmpfs                        tmpfs  1.9G       0  1.9G   0% /dev/shm/dev/sda1                    ext4   485M     33M  427M   8% /boot/dev/sdb1                      ext4    73K   14K     55K  21% /app/logs#一个循环访问的脚本，1.sh#!/usr/bin/bashfor n in `seq 1000000`    #循环执行多少次        do        curl 12.1.1.13   &>/dev/null    #把访问这个网站的结果不管 对错全部放到/dev/null        done [root@localhost /]# sh /tmp/1.sh &     #把这个脚本放到后台执行[root@localhost /]# df -ThFilesystem                   Type   Size    Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root ext4    18G    995M   16G   6% /tmpfs                        tmpfs  1.9G       0  1.9G   0% /dev/shm/dev/sda1                    ext4   485M     33M  427M   8% /boot/dev/sdb1                    ext4    73K     68K  1.0K  99% /app/logs #解决方法一：删除日志文件，重启服务[root@localhost /]# rm -rf /app/logs/access_log       #删除网站访问的日志文件[root@localhost /]# df -ThFilesystem                   Type   Size    Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root ext4    18G    995M   16G   6% /tmpfs                        tmpfs  1.9G       0  1.9G   0% /dev/shm/dev/sda1                    ext4     485M   33M  427M     8% /boot/dev/sdb1                    ext4    73K     68K  1.0K  99% /app/logs#把日志文件删除之后发现磁盘还是满的，这时候是因为删除文件的原理是：硬链接数（i_linke）为0，进程占用（i_count）为0，这个时候虽然硬链接数为0，。但是进程占用数不为0，所以这个文件还时存在的[root@localhost /]#/etc/init.d/httpd restart    #重启服务Stopping httpd:                                              [  OK  ]Starting httpd: httpd: Could not reliably   determine the server's fully qualified domain name, using 12.1.1.13 for   ServerName                                                             [  OK  ][root@localhost /]# df -ThFilesystem                   Type   Size    Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root ext4    18G    995M   16G   6% /tmpfs                        tmpfs  1.9G       0  1.9G   0% /dev/shm/dev/sda1                    ext4   485M     33M  427M   8% /boot/dev/sdb1                    ext4    73K     15K   54K  22% /app/logs#把这个进程关闭在重启，然后进程占用为0，所以磁盘空间下来了。 #解决办法2，直接清空配置文件而不删除[root@localhost /]# echo " " > /app/logs/access_log    #清空文件内容[root@localhost /]# df -ThFilesystem                   Type   Size    Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root ext4    18G    996M   16G   6% /tmpfs                        tmpfs  1.9G       0  1.9G     0% /dev/shm/dev/sda1                    ext4   485M     33M  427M   8% /boot/dev/sdb1                    ext4    73K     16K   53K  24% /app/logs

#如果报一下错误，说明模拟的分区磁盘过小，不足以创建文件系统，我们只需要在dd指令的bs参数后面加上单位，给他大一点就行  [root@localhost /]# mkfs.ext4  /dev/sdc1   mke2fs 1.41.12 (17-May-2010)/dev/sdc1 is not a block special device.Proceed anyway? (y,n) ymkfs.ext4: Device size reported to be   zero.  Invalid partition specified, or          partition table wasn't reread after running fdisk, due to          a modified partition being busy and in use.  You may need to reboot          to re-read your partition table.