On a CentOS Linux 7 server you can use any one of the following tool to manage hostnames:
- hostnamectl command : Control the system hostname. This is recommended method.
- nmtui command : Control the system hostname using text user interface (TUI).
- nmcli command : Control the system hostname using CLI part of NetworkManager.
Types of hostnames
The hostname can be configured as follows
- Static host name assigned by sysadmin. For example, “server1”, “wwwbox2”, or “server42.cyberciti.biz”.
- Transient/dynamic host name assigned by DHCP or mDNS server at run time.
- Pretty host name assigned by sysadmin/end-users and it is a free-form UTF8 host name for presentation to the user. For example, “Vivek’s netbook”.
Static – The static host name is traditional host which can be chosen by the user and is stored in /etc/hostname file.
Transient – The transient host name is maintained by kernel and can be changed by DHCP and mDNS.
Pretty – It is a free form UTF -8 host name for the presentation to the user.
1.Slave I/O: error connecting to master ‘email@example.com:3306’-retry-time: 60 retries: 86400,Error_code:1045
2. Errorreading packet from server: File ‘/home/mysql/mysqlLog/log.000001’ not found(Errcode: 2) ( server_errno=29)
3.Slave SQL: Error ‘Table ‘xxxx’ doesn’t exist’ on query.Default database: ‘t591’.Query: ‘INSERT INTO `xxxx`(type,post_id,browsenum)
SELECT type,post_id,browsenum FROM xxxx WHEREhitdate=’20090209”, Error_code: 1146
由于slave没有此table表，添加这个表，使用slave start 就可以继续同步。 继续阅读
File systems do have limits. Thats no surprise. ext3 had a limit at 16 TB file system size. If you needed more space you´d have to use another file system for instance XFS or JFS or spilt the capacity into multiple mount points.
ext4 was designed to allow far more larger file systems than ext3. According to wikipedia ext4 has a maximum file system size of 1 EiB (approx. one exabyte or 1024 PB or 1024*1024 TB).
Now if you´d try to create one single large file system with ext4 on every linux distribution out there (including OEL 6.1; as of 18th August 2011) you will end up with:
[root@localhost ~]# mkfs.ext4 /dev/iscsi/test mke4fs 1.41.9 (22-Aug-2009)
mkfs.ext4: Size of device /dev/iscsi/test too big to be expressed in 32 bit susing a blocksize of 4096.
This post is about how to solve the issue. 继续阅读