Virtualbox » Historial » Versió 17
Pau Escrich, 06-01-2013 22:36
1 | 13 | Pau Escrich | {{toc}} |
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3 | 1 | Pau Escrich | h1. Virtualbox |
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5 | It is possible to emulate qMp with Virtual Box. |
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6 | |||
7 | 5 | Pau Escrich | First of all open your virtualbox (VB) and create a new machine (type linux 2.6). |
8 | 6 | Pau Escrich | If you are using the VB wizard, do not select any storage device, we will do it latter. |
9 | 5 | Pau Escrich | |
10 | 3 | Pau Escrich | h3. Storage |
11 | 1 | Pau Escrich | |
12 | 10 | Pau Escrich | To make the things easy it is better to use IDE instead of SATA. |
13 | Create a new IDE disk and browse between your foldersand select the qMp vdi image file. |
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14 | |||
15 | 11 | Pau Escrich | The vdi file can be obtained here: http://fw.qmp.cat/testing with the name VBox-qMp_testing-factory-XXXXX.bin |
16 | It should be renamed to something such as VBox-qMp1.vd1 |
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17 | 3 | Pau Escrich | |
18 | 2 | Pau Escrich | h3. Network Configuration |
19 | 1 | Pau Escrich | |
20 | First of all we create a virtual tun/tap device in the host machine. |
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21 | 3 | Pau Escrich | |
22 | 8 | Pau Escrich | <pre>ip tuntap add mode tap dev vbox |
23 | 1 | Pau Escrich | ip link set vbox up |
24 | ip addr add 172.30.22.10/24 dev vbox |
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25 | 3 | Pau Escrich | </pre> |
26 | 1 | Pau Escrich | |
27 | 3 | Pau Escrich | In VB machine configuration at least one network interface must be added. |
28 | 1 | Pau Escrich | It should be configured as bridged interface to our new "vbox" network device. |
29 | The driver "PCnet-PCI II" works fine. |
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30 | |||
31 | |||
32 | h3. Serial |
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33 | 3 | Pau Escrich | |
34 | A serial port is needed because OpenWRT expects it. So it should be added in the VB machine configuration. |
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35 | |||
36 | It is possible to use it to connect with the qMp node from the host machine (useful for debug), but it is NOT NEEDED. |
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37 | To do so you should configure the VB serial as host pipe. |
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38 | 1 | Pau Escrich | Check the option "create pipe" and add the path "/tmp/vboxS0". |
39 | 3 | Pau Escrich | Then in the host machine execute: |
40 | 8 | Pau Escrich | <pre>socat UNIX-CONNECT:/tmp/vboxS0 TCP-LISTEN:7777 & |
41 | 3 | Pau Escrich | netcat localhost 7777 |
42 | </pre> |
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43 | |||
44 | And you will get serial! |
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45 | 9 | Pau Escrich | |
46 | h3. Start VM |
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47 | |||
48 | At this point you can start your virtual machine with qMp, open a browser and go to http://172.30.22.1 |
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49 | |||
50 | If after the first reboot (automatic reboot) it does not boot (stays in "GRUB LOADING") reboot manually the VM. |
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51 | |||
52 | h3. Clone |
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53 | |||
54 | Ok, but just one node is quite boring so let's go to create more of them. Just switch-off the virtual machine, right click and Clone it. |
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55 | Select the option "regenerate MAC addresses", boot the new machine and then execute: |
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56 | |||
57 | <pre>rm /qmp_configured |
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58 | /etc/init.d/qmp_autoconf start |
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59 | </pre> |
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60 | |||
61 | Then both nodes should see each other! |
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62 | 12 | Pau Escrich | |
63 | h1. QEMU |
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64 | |||
65 | It is possible to use the same VirtualBox VDI image file. So again, you can get it from http://fw.qmp.cat |
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66 | Copy it to somewhere and change the name to, for instance "qMp1.vdi". |
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67 | |||
68 | Then just start QEMU: |
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69 | |||
70 | <pre>sudo qemu -net nic,model=pcnet -m 64 -hda qMp1.vdi</pre> |
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71 | 1 | Pau Escrich | |
72 | 14 | Pau Escrich | You can add "-nographic" option and "-daemonize". |
73 | 12 | Pau Escrich | |
74 | h3. Serial |
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75 | |||
76 | Get serial is very easy, just add this option to QEMU |
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77 | |||
78 | <pre>-serial pty</pre> |
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79 | |||
80 | The qmeu will show you the pty device attached to the serial port of the virtual machine, then just use it: |
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81 | |||
82 | <pre>screen /dev/pts/3</pre> |
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83 | |||
84 | Amazing! |
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85 | |||
86 | h3. Network |
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87 | |||
88 | There are several ways to get the network working, I use the combo bridge+tap. |
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89 | In the host machine we will have a bridge named "qemu" and the network interface of the virtual machine |
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90 | will be a tap device attached to such bridge. |
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91 | |||
92 | The next options must be added to the qemu exec command line |
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93 | |||
94 | <pre>-net tap,ifname=qmp1</pre> |
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95 | |||
96 | And these two scripts are needed: |
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97 | |||
98 | */etc/qemu-ifup* |
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99 | <pre> |
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100 | #!/bin/sh |
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101 | if ! brctl show | grep qemu; then |
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102 | brctl addbr qemu |
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103 | ip link set qemu up |
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104 | fi |
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105 | echo "Executing /etc/qemu-ifup" |
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106 | echo "Bringing up $1 for bridged mode..." |
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107 | sudo /sbin/ip link set $1 up promisc on |
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108 | echo "Adding $1 to br0..." |
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109 | sudo brctl addif qemu $1 |
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110 | sleep 2 |
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111 | </pre> |
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112 | |||
113 | */etc/qemu-ifdown* |
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114 | <pre> |
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115 | #!/bin/sh |
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116 | echo "Executing /etc/qemu-ifdown" |
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117 | sudo /sbin/ip link set $1 down |
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118 | sudo /usr/sbin/brctl delif qemu $1 |
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119 | sudo /sbin/ip link delete dev $1 |
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120 | </pre> |
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121 | |||
122 | And make them executable |
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123 | |||
124 | 15 | Pau Escrich | <pre>chmod +x /etc/qemu-*</pre> |
125 | 12 | Pau Escrich | |
126 | To reach the node it is needed to add an IP to the host machine bridge: |
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127 | 1 | Pau Escrich | <pre>ip addr add 172.30.22.10/24 dev qemu</pre> |
128 | 15 | Pau Escrich | |
129 | h3. Multiple nodes |
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130 | |||
131 | Each virtual machine needs its own disk file, so copy the VirtualBox vdi image to, for instance "qMpv2.vdi". |
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132 | You should use a new one, do not copy the image from another existing machine! |
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133 | |||
134 | To skip the problem of duplicate MAC addresses, the option "macaddr" should be added to the previous net option. |
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135 | |||
136 | <pre>-net tap,ifname=qmp1,macaddr=$(/etc/qemu-mac)</pre> |
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137 | |||
138 | And another script is needed (make it executable too!) |
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139 | |||
140 | */etc/qemu-mac* |
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141 | <pre> |
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142 | #!/bin/sh |
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143 | # generate a random mac address for the qemu nic |
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144 | printf 'CA:FE:BA:BE:%02X:%02X\n' $((RANDOM%256)) $((RANDOM%256)) |
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145 | </pre> |
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146 | |||
147 | I use this little script to launch all the virtual machines from a directory: |
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148 | |||
149 | <pre> |
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150 | #!/bin/sh |
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151 | VMDIR="${1:-.}" |
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152 | |||
153 | for IMG in $VMDIR/*.vdi |
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154 | do |
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155 | echo "Starting image $IMG" |
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156 | sudo qemu -net nic,model=pcnet,macaddr=$(/etc/qemu-mac) \ |
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157 | -net tap,ifname=qmp$(($RANDOM%30)) -m 64 -hda $IMG -nographic -serial pty -daemonize |
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158 | done |
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159 | </pre> |
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160 | |||
161 | Example of execution: |
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162 | |||
163 | <pre> |
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164 | p4u@eni4c:~/virtual $ ls |
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165 | qMp1.vdi qMp2.vdi qmpvirt.sh |
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166 | |||
167 | p4u@eni4c:~/virtual $ sh qmpvirt.sh |
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168 | Starting image ./qMp1.vdi |
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169 | Executing /etc/qemu-ifup |
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170 | Bringing up qmp4306 for bridged mode... |
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171 | 16 | Pau Escrich | Adding qmp13 to br0... |
172 | 15 | Pau Escrich | char device redirected to /dev/pts/5 |
173 | |||
174 | Starting image ./qMp2.vdi |
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175 | Executing /etc/qemu-ifup |
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176 | Bringing up qmp21308 for bridged mode... |
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177 | 16 | Pau Escrich | Adding qmp21 to br0... |
178 | 15 | Pau Escrich | char device redirected to /dev/pts/7 |
179 | </pre> |
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180 | 17 | Pau Escrich | |
181 | A more advanced version of this scripts is attached as file to this article. |