分类云计算下的文章

用 fdisk -c=dos 来从63开始分区，而不是2048开始

作者: liujia
时间: February 13, 2020
分类: 阿里云
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现象：一个阿里云的数据盘需要从原40GB扩容到60GB，系统是CentOS7。照阿里云文档中的例子操作，创建新分区后，e2fsck检查文件系统错误，Bad magic number in super-block，磁盘扩容失败。

尝试：对比阿里云文档中的例子，原分区的起始位置是63，不是例子中的2048。但默认fdisk的分区是4k对齐的，并不能从63开始，至少是2048。搜索结果中，有人说用参数 -c=dos 来运行fdisk，就可以从63开始分区，保留原分区的数据进行扩容了。

# fdisk -u /dev/vdb
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): p

Disk /dev/vdb: 64.4 GB, 64424509440 bytes, 125829120 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x4ca57d7e

   Device Boot      Start         End      Blocks   Id  System
/dev/vdb1              63    83885759    41942848+  83  Linux

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-125829119, default 2048): 63
Value out of range.
First sector (2048-125829119, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-125829119, default 125829119):
Using default value 125829119
Partition 1 of type Linux and of size 60 GiB is set

# e2fsck -n /dev/vdb1
e2fsck 1.42.9 (28-Dec-2013)
ext2fs_open2: Bad magic number in super-block
e2fsck: Superblock invalid, trying backup blocks...
e2fsck: Bad magic number in super-block while trying to open /dev/vdb1

The superblock could not be read or does not describe a correct ext2
filesystem.  If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>

fdisk -c=dos /dev/vdb

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (with command 'c').Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): p

Disk /dev/vdb: 64.4 GB, 64424509440 bytes, 125829120 sectors
16 heads, 63 sectors/track, 124830 cylinders
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x4ca57d7e

   Device Boot      Start         End      Blocks   Id  System
/dev/vdb1              63    83885759    41942848+  83  Linux

Command (m for help): d
Selected partition 1
Partition 1 is deleted

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (63-125829119, default 63):
Using default value 63
Last sector, +sectors or +size{K,M,G} (63-125829119, default 125829119):
Using default value 125829119
Partition 1 of type Linux and of size 60 GiB is set

Command (m for help): wq
The partition table has been altered!

参考：

magento - 关闭维护模式 - maintenance:disable

作者: liujia
时间: September 23, 2019
分类: 云计算
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现象：不小心，开始了magento2的维护模式，前后台均无法访问：

1 exception(s):
Exception #0 (Exception): Unable to proceed: the maintenance mode is enabled.

尝试：Shell连接到magento2的安装目录，执行 php bin/magento maintenance:disable 。如返回 Disabled maintenance mode，即可。

参考：https://devdocs.magento.com/guides/v2.3/install-gde/install/cli/install-cli-subcommands-maint.html

cPanel - WHM - 更改 apache2 的默认端口号

作者: liujia
时间: September 22, 2019
分类: 云计算
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问题：在cPanel/WHM环境中想增加varnish作为缓存，需要将apache2的默认80端口改为其它。

过程：浏览到 WHM -> Tweak Settings --> 搜索 port ---> 在 Apache non-SSL IP/port 中输入自定义的端口号

参考：https://www.interserver.net/tips/kb/change-apache-port-number-cpanel-server/

通过命令行参数发送阿里云短信 - python

作者: liujia
时间: August 29, 2019
分类: 阿里云
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阿里云的“消息服务”产品文档中，提供了python的演示例子。简单替换例子文件中的 REGION 等参数就可以运行，成功发出手机短信了。但每次发送不同内容的短信，大概流程是：打开文件，替换短信内容，保存文件，运行python文件，发出短信。如果短信内容中是固定的几个变量，能否通过参数传入到命令行发送呢？

如果您还没有订购阿里云的产品，可点此链接查看优惠价格喔。

过程：

1.修改 demo_sms_send.py 文件内容，在前边添加以下参数设定：

vserver_ip = sys.argv[1]
vserver_expire_time = sys.argv[2]
vclient_phone = sys.argv[3]

2.将设定的参数填写到发送语句中，如：

params = {"server_ip":vserver_ip,"server_expire_time":vserver_expire_time}
print(send_sms(__business_id, vclient_phone, "安群", "SMS_152505789", params))