3 # Copyright (c) 2003 Intel Corporation
6 # Copyright (c) 2004-2006 The Trustees of Princeton University
14 import UpdateNodeConfiguration
15 from Exceptions import *
19 import notify_messages
26 Load the kernel off of a node and boot to it.
27 This step assumes the disks are mounted on SYSIMG_PATH.
28 If successful, this function will not return. If it returns, no chain
31 Expect the following variables:
32 SYSIMG_PATH the path where the system image will be mounted
33 (always starts with TEMP_PATH)
34 ROOT_MOUNTED the node root file system is mounted
35 NODE_SESSION the unique session val set when we requested
36 the current boot state
37 PLCONF_DIR The directory to store PL configuration files in
39 Sets the following variables:
40 ROOT_MOUNTED the node root file system is mounted
43 log.write( "\n\nStep: Chain booting node.\n" )
45 # make sure we have the variables we need
47 SYSIMG_PATH= vars["SYSIMG_PATH"]
49 raise ValueError, "SYSIMG_PATH"
51 PLCONF_DIR= vars["PLCONF_DIR"]
53 raise ValueError, "PLCONF_DIR"
55 # its ok if this is blank
56 NODE_SESSION= vars["NODE_SESSION"]
58 NODE_MODEL_OPTIONS= vars["NODE_MODEL_OPTIONS"]
60 PARTITIONS= vars["PARTITIONS"]
61 if PARTITIONS == None:
62 raise ValueError, "PARTITIONS"
65 raise BootManagerException, "Missing variable in vars: %s\n" % var
66 except ValueError, var:
67 raise BootManagerException, "Variable in vars, shouldn't be: %s\n" % var
70 if vars.has_key('ROOT_MOUNTED'):
71 ROOT_MOUNTED= vars['ROOT_MOUNTED']
74 log.write( "Mounting node partitions\n" )
76 # simply creating an instance of this class and listing the system
77 # block devices will make them show up so vgscan can find the planetlab
79 systeminfo.get_block_device_list(vars, log)
81 utils.sysexec( "vgscan", log )
82 utils.sysexec( "vgchange -ay planetlab", log )
84 utils.makedirs( SYSIMG_PATH )
86 cmd = "mount %s %s" % (PARTITIONS["root"],SYSIMG_PATH)
87 utils.sysexec( cmd, log )
88 cmd = "mount -t proc none %s/proc" % SYSIMG_PATH
89 utils.sysexec( cmd, log )
90 cmd = "mount %s %s/vservers" % (PARTITIONS["vservers"],SYSIMG_PATH)
91 utils.sysexec( cmd, log )
94 vars['ROOT_MOUNTED']= 1
97 # write out the session value /etc/planetlab/session
99 session_file_path= "%s/%s/session" % (SYSIMG_PATH,PLCONF_DIR)
100 session_file= file( session_file_path, "w" )
101 session_file.write( str(NODE_SESSION) )
104 log.write( "Updated /etc/planetlab/session\n" )
106 log.write( "Unable to write out /etc/planetlab/session, continuing anyway\n" )
108 # update configuration files
109 log.write( "Updating configuration files.\n" )
111 cmd = "/etc/init.d/conf_files start --noscripts"
112 utils.sysexec_chroot( SYSIMG_PATH, cmd, log )
114 log.write("conf_files failed with \n %s" % e)
116 # update node packages
117 log.write( "Running node update.\n" )
118 if os.path.exists( SYSIMG_PATH + "/usr/bin/NodeUpdate.py" ):
119 cmd = "/usr/bin/NodeUpdate.py start noreboot"
121 # for backwards compatibility
122 cmd = "/usr/local/planetlab/bin/NodeUpdate.py start noreboot"
123 utils.sysexec_chroot( SYSIMG_PATH, cmd, log )
125 # the following step should be done by NM
126 UpdateNodeConfiguration.Run( vars, log )
128 log.write( "Updating ssh public host key with PLC.\n" )
131 ssh_host_key_file= file("%s/etc/ssh/ssh_host_rsa_key.pub"%SYSIMG_PATH,"r")
132 ssh_host_key= ssh_host_key_file.read().strip()
133 ssh_host_key_file.close()
134 ssh_host_key_file= None
139 update_vals['ssh_host_key']= ssh_host_key
140 BootAPI.call_api_function( vars, "BootUpdateNode", (update_vals,) )
142 # get the kernel version
144 if NODE_MODEL_OPTIONS & ModelOptions.SMP:
147 log.write( "Copying kernel and initrd for booting.\n" )
148 utils.sysexec( "cp %s/boot/kernel-boot%s /tmp/kernel" % (SYSIMG_PATH,option), log )
149 utils.sysexec( "cp %s/boot/initrd-boot%s /tmp/initrd" % (SYSIMG_PATH,option), log )
153 log.write( "Unmounting disks.\n" )
154 utils.sysexec( "umount %s/vservers" % SYSIMG_PATH, log )
155 utils.sysexec( "umount %s/proc" % SYSIMG_PATH, log )
156 utils.sysexec( "umount %s" % SYSIMG_PATH, log )
157 utils.sysexec( "vgchange -an", log )
160 vars['ROOT_MOUNTED']= 0
162 log.write( "Unloading modules and chain booting to new kernel.\n" )
164 # further use of log after Upload will only output to screen
167 # regardless of whether kexec works or not, we need to stop trying to
169 cancel_boot_flag= "/tmp/CANCEL_BOOT"
170 utils.sysexec( "touch %s" % cancel_boot_flag, log )
172 # on 2.x cds (2.4 kernel) for sure, we need to shutdown everything
173 # to get kexec to work correctly. Even on 3.x cds (2.6 kernel),
174 # there are a few buggy drivers that don't disable their hardware
175 # correctly unless they are first unloaded.
177 utils.sysexec_noerr( "ifconfig eth0 down", log )
179 utils.sysexec_noerr( "killall dhclient", log )
181 utils.sysexec_noerr( "umount -a -r -t ext2,ext3", log )
182 utils.sysexec_noerr( "modprobe -r lvm-mod", log )
184 # modules that should not get unloaded
185 # unloading cpqphp causes a kernel panic
186 blacklist = [ "floppy", "cpqphp", "i82875p_edac", "mptspi"]
188 modules= file("/tmp/loadedmodules","r")
191 module= string.strip(line)
192 if module in blacklist :
193 log.write("Skipping unload of kernel module '%s'.\n"%module)
195 log.write( "Unloading %s\n" % module )
196 utils.sysexec_noerr( "modprobe -r %s" % module, log )
197 if "e1000" in module:
198 log.write("Unloading e1000 driver; sleeping 4 seconds...\n")
203 log.write( "Couldn't read /tmp/loadedmodules, continuing.\n" )
206 modules= file("/proc/modules", "r")
208 # Get usage count for USB
212 # Module Size UsageCount UsedBy State LoadAddress
213 parts= string.split(line)
215 if parts[0] == "usb_storage":
216 usb_usage += int(parts[2])
217 except IndexError, e:
218 log.write( "Couldn't parse /proc/modules, continuing.\n" )
224 # Module Size UsageCount UsedBy State LoadAddress
225 parts= string.split(line)
227 # While we would like to remove all "unused" modules,
228 # you can't trust usage count, especially for things
229 # like network drivers or RAID array drivers. Just try
230 # and unload a few specific modules that we know cause
231 # problems during chain boot, such as USB host
232 # controller drivers (HCDs) (PL6577).
233 # if int(parts[2]) == 0:
234 if False and re.search('_hcd$', parts[0]):
236 log.write( "NOT unloading %s since USB may be in use\n" % parts[0] )
238 log.write( "Unloading %s\n" % parts[0] )
239 utils.sysexec_noerr( "modprobe -r %s" % parts[0], log )
240 except IndexError, e:
241 log.write( "Couldn't parse /proc/modules, continuing.\n" )
243 log.write( "Couldn't read /proc/modules, continuing.\n" )
246 kargs = "root=%s ramdisk_size=8192" % PARTITIONS["mapper-root"]
247 if NODE_MODEL_OPTIONS & ModelOptions.SMP:
248 kargs = kargs + " " + "acpi=off"
250 kargsfb = open("/kargs.txt","r")
251 moreargs = kargsfb.readline()
253 moreargs = moreargs.strip()
254 log.write( 'Parsed in "%s" kexec args from /kargs.txt\n' % moreargs )
255 kargs = kargs + " " + moreargs
257 # /kargs.txt does not exist, which is fine. Just kexec with default
258 # kargs, which is ramdisk_size=8192
261 utils.sysexec_noerr( 'hwclock --systohc --utc ' )
262 utils.breakpoint ("Before kexec");
264 utils.sysexec( 'kexec --force --initrd=/tmp/initrd ' \
265 '--append="%s" /tmp/kernel' % kargs)
266 except BootManagerException, e:
267 # if kexec fails, we've shut the machine down to a point where nothing
268 # can run usefully anymore (network down, all modules unloaded, file
269 # systems unmounted. write out the error, and cancel the boot process
272 log.write( "-------------------------------------------------------\n" )
273 log.write( "kexec failed with the following error. Please report\n" )
274 log.write( "this problem to support@planet-lab.org.\n\n" )
275 log.write( str(e) + "\n\n" )
276 log.write( "The boot process has been canceled.\n" )
277 log.write( "-------------------------------------------------------\n\n" )