内网服务器使用SSH端口转发访问外网

很多使用我们不能在内网防火墙中的服务器上使用yum等工具，不过我们可以使用SSH来映射本地端口到服务器完成。

在你的笔记本电脑上使用以下Python（twisted）来做一个代理，当然你也可以用nodejs，Perl，或者直接用Squid等。

from twisted.web import proxy, http
from twisted.internet import reactor


class ProxyFactory(http.HTTPFactory):

    def buildProtocol(self, addr):
        return proxy.Proxy()


reactor.listenTCP(8080, ProxyFactory())
reactor.run()

 

然后把这个8080端口映射到内网服务器上的8083端口上

ssh -g -R 8083:localhost:8080 remote-server

最后在内网服务器上使用代理

export http_proxy="http://localhost:8083"

Increase A VMware Disk Size (VMDK) Formatted As Linux LVM

3) Partitioning the unalloced space

Once you've changed the disk's size, either boot up your VM again, or restart if it was still running. Linux needs to boot with the new disk, so it can see you've added (unallocated) disk space.

Once you've booted again, you can check if the extra space can be seen on the disk.

lb02.lab.mojah.be ~ $ fdisk -l

Disk /dev/sda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14         391     3036285   8e  Linux LVM

So the server can now see the 10GB hard disk. Let's create a partition, by start fdisk for the /dev/sda device.

lb02.lab.mojah.be ~ $ fdisk /dev/sda

The number of cylinders for this disk is set to 1305.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): n

Now enter 'n', to create a new partition.

Command action
e   extended
p   primary partition (1-4)
p

Now choose "p" to create a new primary partition. Please note, your system can only have 4 primary partitions on this disk! If you've already reached this limit, create an extended partition.

Partition number (1-4): 3

Choose your partition number. Since I already had /dev/sda1 and /dev/sda2, the logical number would be 3.

First cylinder (392-1305, default 392): <enter>
Using default value 392
Last cylinder or +size or +sizeM or +sizeK (392-1305, default 1305): <enter>
Using default value 1305

Note; the cylinder values will vary on your system. It should be safe to just hint enter, as fdisk will give you a default value for the first and last cylinder (and for this, it will use the newly added diskspace).

Command (m for help): t
Partition number (1-4): 3
Hex code (type L to list codes): 8e
Changed system type of partition 3 to 8e (Linux LVM)

Now type t to change the partition type. When prompted, enter the number of the partition you've just created in the previous steps. When you're asked to enter the "Hex code", enter 8e, and confirm by hitting enter.

Command (m for help): w

Once you get back to the main command within fdisk, type w to write your partitions to the disk. You'll get a message about the kernel still using the old partition table, and to reboot to use the new table. Please obey kindly, and reboot the virtual machine.

After you've rebooted, you can see the newly created partition with fdisk.

lb02.lab.mojah.be ~ $ fdisk -l

Disk /dev/sda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14         391     3036285   8e  Linux LVM
/dev/sda3             392        1305     7341705   8e  Linux LVM

3) Extend your Logical Volume with the new partition

Now, create the physical volume as a basis for your LVM. Please replace /dev/sda3 with the newly created partition.

lb02.lab.mojah.be ~ $ pvcreate /dev/sda3
Physical volume "/dev/sda3″ successfully created

Now find out how your Volume Group is called.

lb02.lab.mojah.be ~ $ vgdisplay
--- Volume group ---
VG Name               VolGroup00
...

Let's extend that Volume Group by adding the newly created physical volume to it.

lb02.lab.mojah.be ~ $ vgextend VolGroup00 /dev/sda3
Volume group "VolGroup00″ successfully extended

With pvscan, we can see our newly added physical volume, and the usable space (7GB in this case).

lb02.lab.mojah.be ~ $ pvscan
PV /dev/sda2   VG VolGroup00   lvm2 [2.88 GB / 0    free]
PV /dev/sda3   VG VolGroup00   lvm2 [7.00 GB / 7.00 GB free]
Total: 2 [9.88 GB] / in use: 2 [9.88 GB] / in no VG: 0 [0   ]

Now we can extend Logical Volume (as opposed to the Physical Volume we added to the group earlier). The command is "lvextend /dev/VolGroupxx /dev/sdXX".

lb02.lab.mojah.be ~ $ lvextend /dev/VolGroup00/LogVol00 /dev/sda3
Extending logical volume LogVol00 to 9.38 GB
Logical volume LogVol00 successfully resized

If you're running this on Ubuntu, use the following.

lb02.lab.mojah.be ~ $ lvextend /dev/mapper/vg-name /dev/sda3

All that remains now, it to resize the file system to the volume group, so we can use the space. Replace the path to the correct /dev device if you're on ubuntu/debian like systems.

lb02.lab.mojah.be ~ $ resize2fs /dev/VolGroup00/LogVol00
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/VolGroup00/LogVol00 is mounted on /; on-line resizing required
Performing an on-line resize of /dev/VolGroup00/LogVol00 to 2457600 (4k) blocks.
The filesystem on /dev/VolGroup00/LogVol00 is now 2457600 blocks long.

And we're good to go!

lb02.lab.mojah.be ~ $ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00 9.1G 1.8G  6.9G  21% /
/dev/sda1              99M   18M   77M  19% /boot
tmpfs                 125M     0  125M   0% /dev/shm