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Created Mounting multiple disks in iPXE mode (markdown)
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Mounting-multiple-disks-in-iPXE-mode.md
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Mounting-multiple-disks-in-iPXE-mode.md
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## Test Environment
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| Term | Definition |
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|-----------------------|--------------------------------------------------|
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| Host OS | MacOS high Sierra |
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| RancherOS | v1.1.3 |
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| Platform | Virtualbox |
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| Root Disk(/dev/sda) | 4GB |
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| Other Disk(/dev/sdb) | 3GB |
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| CPU | 1C |
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| MEM | 2GB |
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We use this environment to demonstrate the whole process.
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## Enable iPXE
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Follow the previous instructions to create a VM named `IPXE`. In the boot order, the hard disk boot is the first.
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Then we need to create the boot file of iPXE at the host location, the path here should be `~/Library/VirtualBox/TFTP/IPXE.pxe`, its content is probably like this:
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```
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#!ipxe
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dhcp
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set base-url http://192.168.1.125/rancheros/ipxe
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kernel ${base-url}/vmlinuz printk.devkmsg=on console=tty1 rancher.autologin=tty1 rancher.cloud_init.datasources=[url:${base-url}/cloud-config.yaml] rancher.password=rancher
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initrd ${base-url}/initrd
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boot
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```
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The content of cloud-config.yaml can be defined by the user. Here we configure like this:
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```
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#cloud-config
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runcmd:
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- [ mkdir, -p, /mnt/user-docker]
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- [ mount, -t, ext4, /dev/sdb, /mnt/user-docker ]
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rancher:
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docker:
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graph: "/mnt/user-docker"
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...
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...
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```
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## Mounting multiple disks
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Now we can boot the IPXE VM for the first time. After booting is complete, we can ssh to this VM with `rancher` password:
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```
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# There are two disks
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[root@rancher rancher]# fdisk -l
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Disk /dev/sdb: 3 GiB, 3221225472 bytes, 6291456 sectors
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Units: sectors of 1 * 512 = 512 bytes
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Sector size (logical/physical): 512 bytes / 512 bytes
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I/O size (minimum/optimal): 512 bytes / 512 bytes
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Disk /dev/sda: 4 GiB, 4294967296 bytes, 8388608 sectors
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Units: sectors of 1 * 512 = 512 bytes
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Sector size (logical/physical): 512 bytes / 512 bytes
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I/O size (minimum/optimal): 512 bytes / 512 bytes
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# We haven't mounted any disks yet, so you can see these
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[root@rancher rancher]# df -hT
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Filesystem Type Size Used Available Use% Mounted on
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overlay overlay 998.1M 180.2M 817.9M 18% /
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tmpfs tmpfs 942.0M 0 942.0M 0% /dev
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tmpfs tmpfs 998.1M 0 998.1M 0% /sys/fs/cgroup
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tmpfs tmpfs 998.1M 0 998.1M 0% /media
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none tmpfs 998.1M 752.0K 997.4M 0% /run
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tmpfs tmpfs 998.1M 100.0K 998.0M 0% /mnt
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devtmpfs devtmpfs 942.0M 0 942.0M 0% /host/dev
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shm tmpfs 64.0M 0 64.0M 0% /host/dev/shm
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none tmpfs 998.1M 752.0K 997.4M 0% /var/run
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tmpfs tmpfs 998.1M 180.2M 817.9M 18% /etc/hostname
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shm tmpfs 64.0M 0 64.0M 0% /dev/shm
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devtmpfs devtmpfs 942.0M 0 942.0M 0% /dev
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shm tmpfs 64.0M 0 64.0M 0% /dev/shm
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```
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Let's manually format /dev/sdb first, here we need to format all the disks except the root disk:
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```
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[root@rancher rancher]# mkfs.ext4 /dev/sdb
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mke2fs 1.43.9 (8-Feb-2018)
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Creating filesystem with 786432 4k blocks and 196608 inodes
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Filesystem UUID: b7c1c6d1-b96b-4783-8c1f-9cd375c404dd
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Superblock backups stored on blocks:
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32768, 98304, 163840, 229376, 294912
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Allocating group tables: done
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Writing inode tables: done
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Creating journal (16384 blocks): done
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Writing superblocks and filesystem accounting information: done
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```
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Then we have to install ros on the root disk(/dev/sda):
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```
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$ wget http://192.168.1.125/rancheros/ipxe/cloud-config.yaml
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$ ros install -c cloud-config.yaml -d /dev/sda
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```
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When the VM starts up again, we can check the user-docker and mount points.
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```
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[root@rancher rancher]# docker info
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...
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...
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Name: rancher
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ID: 2VW4:R7DN:KPX7:EIGW:XSAM:QPFU:VFPG:LJAJ:GTJX:RZ5H:Z7G3:N2JS
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Docker Root Dir: /mnt/user-docker
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Debug Mode (client): false
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Debug Mode (server): false
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...
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...
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[root@rancher rancher]# df -hT | grep sdb
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/dev/sdb ext4 2.9G 9.3M 2.8G 0% /mnt/user-docker
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/dev/sdb ext4 2.9G 9.3M 2.8G 0% /mnt/user-docker/plugins
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/dev/sdb ext4 2.9G 9.3M 2.8G 0% /mnt/user-docker/overlay
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```
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## Others
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There was a bug for cloudinit url datasource in v1.1.3, please refer to this [issue](https://github.com/rancher/os/issues/2144) .
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In the case of multiple nics, the content of the url sometimes fails to download.
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It has been fixed in v1.1.4 and v1.2.0.
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