python运维实战--LVM创建和在线扩容，,python运维实战

python运维实战--LVM创建和在线扩容，,python运维实战

python运维实战--LVM创建和在线扩容

LVM有关概念和操作

CentOS LVM卷转变成普通卷操作步骤linux 缩减文件系统大小 LVMlinux7创建逻辑卷lv报错问题

说明??：有关LVM详细概念，请各位大佬自行百度，谷歌。。这里不做重点介绍。

这个python脚本能做什么

创建LVM

指定具体磁盘进行分区，这里定义分区号1刷新分区，不需要reboot系统创建pv创建vg创建lv格式化，ext4/xfs创建挂载目录将文件系统信息写到 /etc/fstab使用 mount -a 自动挂载

在线扩容vg／lv

磁盘分区刷新分区信息创建pv在线扩容vg在线扩容lv扩容后容量刷新

python 脚本信息

#!/usr/bin/env python# coding=utf-8__author__ = "wutengfei"__email__ = "[email protected]"__status__ = "Production"__version__ = "1.0"from optparse import OptionParserfrom subprocess import Popen, call, PIPEfrom shlex import splitfrom commands import getstatusoutputfrom os import mkdirfrom os.path import basename , normpathimport timeparser = OptionParser()parser.add_option(‘-d‘, ‘--drive‘, dest=‘drive‘, help=‘this is the name of the drive like sda, hdd etc..‘)parser.add_option(‘-f‘, ‘--folder‘, dest=‘folder‘, help=‘this is the name of the directory like /data or /var/log‘)parser.add_option(‘-t‘, ‘--fstype‘, dest=‘fstype‘, help=‘this is the type of filesystem you need like ext4 or xfs‘)(opts,args) = parser.parse_args()class FormatDriver(object):    """    This is a class that does end to end create partition, deal with lvm, make filesystem, extend filesystem, write to fstab and resize filesystem    """    def __init__(self,drive,folder,fstype):        self.drive = str(drive)        self.folder = str(folder)        self.fstype = str(fstype)    def fdisk(self):        """        this is a definition to perform fdisk the drive in the argument        """        before_pipe_cmd = ‘echo -e "n\np\n1\n\n\nt\\n8e\nw"‘        before_pipe_args = split(before_pipe_cmd)        after_pipe_cmd = "fdisk /dev/%s" % self.drive        after_pipe_args = split(after_pipe_cmd)        p1 = Popen(before_pipe_args, stdout=PIPE)        p2 = call(after_pipe_args, stdin=p1.stdout)    def partprobe(self):        """        this function performs the partprobe        """        pprobe = "partprobe"        pprobe1 = split(pprobe)        part = call(pprobe1)    def pvcreate(self):        """        This function creates the physical volume        """        pvcreate = call(["pvcreate", "/dev/%s1" %self.drive])    def volgroup(self):        """        This function creates the physical volume and also created the volume group        """        vgcreate = ‘vgcreate -v vg_%s /dev/%s1‘ % (basename(normpath(self.folder)), self.drive)        status, output = getstatusoutput(vgcreate)    def lvm(self):        """        This function creates the logical volume        """        lvcreate = ‘lvcreate -v -l "100%FREE" -n lv_{0} vg_{1}‘.format(basename(normpath(self.folder)),                                                                       basename(normpath(self.folder)))        status, output = getstatusoutput(lvcreate)        print status        print output    def makefs(self):        ‘‘‘This functions creates the filesystem on the /dev/mapper LVM device‘‘‘        if self.fstype == ‘ext4‘:            mkfs = call(["mkfs.ext4", "/dev/mapper/vg_%s-lv_%s" % (            basename(normpath(self.folder)), basename(normpath(self.folder)))])        elif self.fstype == ‘xfs‘:            mkfs = call(["mkfs.xfs", "/dev/mapper/vg_%s-lv_%s" % (            basename(normpath(self.folder)), basename(normpath(self.folder)))])    def makedir(self):        ‘‘‘This function makes directory inthe /root level‘‘‘        path = "%s" % self.folder        mkdir(path, 0755)        print ‘%s is created‘ % path    def write_to_fstab(self):        ‘‘‘This function appends the filesystem info to the /etc/fstab‘‘‘        if self.fstype == ‘ext4‘:            string = ‘/dev/mapper/vg_%s-lv_%s     %s           ext4    defaults        1 1‘ % (            basename(normpath(self.folder)), basename(normpath(self.folder)), self.folder)            f = open("/etc/fstab", ‘a‘)            f.write(string + "\n")            f.close()        elif self.fstype == ‘xfs‘:            string = ‘/dev/mapper/vg_%s-lv_%s     %s           xfs    defaults        1 1‘ % (            basename(normpath(self.folder)), basename(normpath(self.folder)), self.folder)            f = open("/etc/fstab", ‘a‘)            f.write(string + "\n")            f.close()    def filesystem_mount(self):        ‘‘‘This is a simple function to mount all the drive‘‘‘        fsmount = ‘mount -a‘        status, output = getstatusoutput(fsmount)    def resizefs(self):        ‘‘‘ This method is to resize an existing filesystem‘‘‘        if self.fstype == ‘ext4‘:            rs = ‘resize2fs /dev/vg_%s/lv_%s‘ % (basename(normpath(self.folder)), basename(normpath(self.folder)))            status, output = getstatusoutput(rs)        elif self.fstype == ‘xfs‘:            rs = ‘xfs_growfs /dev/vg_%s/lv_%s‘ % (basename(normpath(self.folder)), basename(normpath(self.folder)))            status, output = getstatusoutput(rs)    def extend_vg(self):        ‘‘‘Extending volume group‘‘‘        vgextend = ‘vgextend vg_%s /dev/%s1‘ % (basename(normpath(self.folder)), self.drive)        status, output = getstatusoutput(vgextend)    def extend_lv(self):        ‘‘‘Extending logical volume‘‘‘        lvextend = call(["lvextend", "-l", "+100%FREE",                         "/dev/vg_%s/lv_%s" % (basename(normpath(self.folder)), basename(normpath(self.folder)))])def main():    x = FormatDriver(opts.drive, opts.folder, opts.fstype)    intake = raw_input("Do you want to extend of create a new filesystem ? please enter ‘extend‘ or ‘create‘:")    if intake == ‘create‘:        print "a new drive has been created"        x.fdisk()        x.partprobe()        x.pvcreate()        time.sleep(5)        x.volgroup()        time.sleep(5)        x.lvm()        x.makefs()        x.makedir()        x.write_to_fstab()        x.filesystem_mount()    elif intake == ‘extend‘:        print "a drive has been extended"        x.fdisk()        x.partprobe()        x.pvcreate()        x.extend_vg()        x.extend_lv()        x.resizefs()if __name__ == ‘__main__‘:    if opts.drive == None or opts.folder == None or opts.fstype == None:        parser.print_help()        exit(-1)main()print ‘The root folder is %s‘ % opts.folderprint ‘the drive is %s‘ % opts.driveprint ‘The fstype is %s‘ % opts.fstype

脚本执行情况

实战创建LVM

# python test.py -d sdb -f /data1 -t ext4Do you want to extend of create a new filesystem ? please enter ‘extend‘ or ‘create‘:createa new drive has been created欢迎使用 fdisk (util-linux 2.23.2)。..../data1 is createdThe root folder is /data1the drive is sdbThe fstype is ext4

说明??：如果执行脚本时不使用任何参数，则会提示帮助信息，如：

# python test.py Usage: test.py [options]Options:  -h, --help            show this help message and exit  -d DRIVE, --drive=DRIVE                        this is the name of the drive like sda, hdd etc..  -f FOLDER, --folder=FOLDER                        this is the name of the directory like /data or                        /var/log  -t FSTYPE, --fstype=FSTYPE                        this is the type of filesystem you need like ext4 or                        xfs

python运维实战--LVM创建和在线扩容