Download Easy File Sharing FTP Server for Windows to search for and download files from computers of your peers. In addition to public file sharing, users can also email a link to a public share directly from within the Cerberus FTP Server web client. Users just need to click the 'Email' button on a file to open a dialog for emailing the file. Revoking Public File or Folder Access. Though, everybody has a different objective of using an FTP server however the major objectives behind the use of an FTP Portal are:. As the name suggests, File Transfer Protocol (FTP) is majorly used for File Sharing. File sharing and storage made simple, now securely send large files fast with.
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In Linux system, storage settings are mainly as follows:
DAS
DAS refers to Direct Attached Storage, which is directly connected to additional storage. This device is directly connected to the computer motherboard bus. The computer recognizes it as a piece of equipment, such as common hard disk, U disk, etc. This device is difficult to share.
NAS
NAS refers to the Network Area Storage, which generally shares the local storage space to other hosts for use, usually through the C/S architecture to achieve communication. It realizes file level sharing. The computer usually recognizes the shared settings as a file system, and its file server manages locks to achieve concurrent access. The common NAS are NFS and CIFS.
SANSAN refers to Storage Area Network, which simulates the transmission network as SCSI bus. Each host's network card is equivalent to the initiator in SCSI bus, and the server is equivalent to one or more targets. It needs to encapsulate SCSI messages through FC or TCP/IP protocol with the help of SCSI driver of client and server. It implements block-level sharing and is usually recognized as a block device, but it requires special lock management software to achieve concurrent access to multiple hosts.
FTP
FTP is a file transfer protocol. The client needs to use a special FTP client to communicate with the server to upload and download files. FTP protocol works in the application layer. It uses two connections to communicate with the client:
- Command connection: used to transfer file management commands. This connection will always be online after the client connects.
- Data connection: Used to transfer file data. This connection is created sequentially
FTP server monitors TCP 21 port for command connection, and data connection has two modes:
- In active mode, the server actively creates a random port connected to the client using TCP port 20
- In passive mode, clients use random ports to connect to random ports on the server side
The FTP client software commonly used in Linux includes lftp, ftp, lftpget, wget, curl, etc. Software such as browser, resource manager or Filezilla can be used in Windows.
Response codes similar to HTTP protocol are used in FTP protocol:
- 1xx: Tips
- 2xx: Successful Class Status Code
- 3xx: A status code indicating the need for additional class information
- 4xx: Client error
- 5xx: Server Error
The following describes the use of vsftpd server software. When FTP authenticates users, it will use users in the system for identity authentication. At the same time, FTP supports virtual users. Virtual users also need to be mapped to a user in the system. Anonymous users will be mapped to FTP users in the system.
configuration file
Vsftpd uses PAM module to authenticate user identity, and the configuration file is/etc/pam.d/vsftpdThe main configuration file for vsftpd is/etc/vsftpd/vsftpd.conf
When users access FTP, the default access location is the user's own home directory. The FTP user's home directory is/var/ftp/, so using anonymous users will access by default/var/ftpCatalog.
Configuration of anonymous users
vsftpd.confFor anonymous users, there are
Configuration of local users
When system users log in to FTP, they default to be in their home directory, but they can also access other directories of the system, which is usually unsafe. System users can be confined to their home directories:
Users can also be designated to confine them in their home directories:
Ifchroot_local_userIf it is no, the user in the chroot list file will be imprisoned in the home directory, ifchroot_local_userFor YES, it means that only users in the chroot_list file will not be confined to the home directory.
Journal
Change ownership of uploaded files
Connection restriction
User login control
Virtual user
In FTP, all virtual users are mapped to a designated system account, and the default directory accessed is the home directory for that account. Virtual user accounts can also be stored in files or relational databases.
Store FTP virtual users in Databases
Preparing database and related tables
Adding virtual users
FTP server monitors TCP 21 port for command connection, and data connection has two modes:
- In active mode, the server actively creates a random port connected to the client using TCP port 20
- In passive mode, clients use random ports to connect to random ports on the server side
The FTP client software commonly used in Linux includes lftp, ftp, lftpget, wget, curl, etc. Software such as browser, resource manager or Filezilla can be used in Windows.
Response codes similar to HTTP protocol are used in FTP protocol:
- 1xx: Tips
- 2xx: Successful Class Status Code
- 3xx: A status code indicating the need for additional class information
- 4xx: Client error
- 5xx: Server Error
The following describes the use of vsftpd server software. When FTP authenticates users, it will use users in the system for identity authentication. At the same time, FTP supports virtual users. Virtual users also need to be mapped to a user in the system. Anonymous users will be mapped to FTP users in the system.
configuration file
Vsftpd uses PAM module to authenticate user identity, and the configuration file is/etc/pam.d/vsftpdThe main configuration file for vsftpd is/etc/vsftpd/vsftpd.conf
When users access FTP, the default access location is the user's own home directory. The FTP user's home directory is/var/ftp/, so using anonymous users will access by default/var/ftpCatalog.
Configuration of anonymous users
vsftpd.confFor anonymous users, there are
Configuration of local users
When system users log in to FTP, they default to be in their home directory, but they can also access other directories of the system, which is usually unsafe. System users can be confined to their home directories:
Users can also be designated to confine them in their home directories:
Ifchroot_local_userIf it is no, the user in the chroot list file will be imprisoned in the home directory, ifchroot_local_userFor YES, it means that only users in the chroot_list file will not be confined to the home directory.
Journal
Change ownership of uploaded files
Connection restriction
User login control
Virtual user
In FTP, all virtual users are mapped to a designated system account, and the default directory accessed is the home directory for that account. Virtual user accounts can also be stored in files or relational databases.
Store FTP virtual users in Databases
Preparing database and related tables
Adding virtual users
User passwords are encrypted using MySQL's password () function. If pam_mysql's password () function is different from MySQL's password () function, the password can also be stored in plaintext.
installpam_mysqlPacket, file needed to establish PAM authentication, edit/etc/pam.d/vsftpd.mysql
Modify the vsftpd configuration file to use MySQL authentication
System Users Establishing Virtual User Mapping
Enable vsftpd service vsftpd start
Now, you can use the Foo and bar users in the database to log in to FTP.
NFS
The full name of NFS is Network File System. Like other file systems, NFS is implemented in the Linux kernel, so it is difficult for NFS to be compatible with Windows. The file system shared by NFS will be recognized as a file system by the client, which can be mounted and used directly by the client.
The implementation of NFS uses the mechanism of RPC (Remote Procedure Call), which enables the client to call the function of the server. Because of the existence of VFS, the client can use the NFS file system as other common file systems. The call request of the NFS file system is sent to the NFS service of the server through TCP/IP by the operating system kernel, and the related operation is executed. The server then returns the operation result to the client.
NFS file system only supports IP-based user access control. NFS is implemented in the kernel. Therefore, NFS services are monitored by the kernel on port 2049 of TCP and UDP. Support for NFS services needs to be selected at the time of kernel compilation. It also uses several user-space processes for access control, user mapping, and other services. These processes arenfs-utilsPackage provided.
RPC service is renamed PortMapper after CentOS 6.5. It listens on port 111 of TCP/UDP. When other RPC-based service processes need to listen, they first register as RPC service, and the RPC service allocates a random port for them to use. When the client requests, it first requests the port corresponding to the service listening to the RPC service, and then makes the call request to the changed service.
View the RPC Service List:
Enabling NFS services requires only editing/etc/exportsThe file format is as follows
For example, sharing/shared/nfsThe directory is given to the client of 10.0.0.0/8 network segment and has read and write permission:
Then start the NFS service
In the sharing options in brackets, the following options can customize NFS:
When using files on file systems mounted by NFS, users usually have limited access. That is to say, users access files as anonymous users. By default, these users only have read-only access to these files. If users want to access files on remote file systems as root users or other users with locked meanings, NFS allows users to designate users to access remote files — user mapping by user identification number (UID) and group identification number (GID).
Options for user mapping:
Ftp File Sharing Software
How to mount NFS file system on client side
It can also be usedshowmountCommand to view a list of shared NFS file systems on the host
Where IP_ADDR is the NFS server address.
If the server side modifies the configuration of NFS and does not want to restart the NFS service (because the client is using it), it can be usedexportfsCommand to reload the NFS configuration.
Samba
NFS can only be shared between Unix systems, but Windows has limited support for it. Therefore, some people have implemented the CIFS protocol, also known as SMB (Simple Message Block) protocol, which is used in Windows file sharing in Linux/Unix system. This makes it possible to share files freely between Windows/Linux/Unix.
Samba mainly listens on these ports: 137 / UDP, 138 / UDP, 139 / TCP, 445 / TCP
Shared file systems in Windows can be accessed using Samba clients in Linux or directly mounted.
To view the file system shared by a host:
After obtaining the information, usesmbclientVisit
Mount-based access:
To build a samba server in Linux, you need to install itsambaPackage, which has two services, includingsmbProviding data access,nmbProvide the implementation of NetBIOS.
Saba's motherboard configuration file is:/etc/samba/smb.conf
Users in Samba services must be users existing in the system. When they are used, they need to be added to Samba for use.smbpasswdOrder:
configuration file
smb.confIt includes many global settings, Windows domain settings and so on.
Global configuration
log option
Ftp To Dropbox
Common Sharing Options Bluestacks 3 review.
Ftp File-sharing Service
When the configuration is complete, it can be usedtestparmThe command view grammar was used incorrectly.
