Virtual host isolation
One embodiment of the present invention provides a system for isolating virtual hosts on a network server device. During operation, the system creates a container for a virtual host of a plurality of virtual hosts of a web server running on the network server device. A respective virtual host of the plurality of virtual hosts represents a website running on the web server. If the system receives a web request for a dynamic resource from a client, the system identifies the virtual host as associated with the web request. The system then runs a script interpreter process for generating the dynamic resource in the container and sends a response message comprising the dynamic resource to the client.
1. A computer-implemented method for isolating virtual hosts on a computing system, comprising:
creating, by the computing system, a container for a virtual host of a web server running on the computing system by creating a directory tree for the virtual host and setting a home directory of the directory tree as a root directory for the virtual host;
operating a container process manager on the virtual host in the container;
in response to receiving a web request for a dynamic web resource from a client by the container process manager on the virtual host,
spawning a child process from the container process manager and restricting the child process within the container and a process identifier (PID) namespace for the virtual host of the web server;
running the child process for generating the dynamic web resource in the container; and
sending, by the container process manager, a response message comprising the dynamic web resource to the client.
2. The method of claim 1 ,
wherein the directory tree includes one or more common resource utilization directories.
3. The method of claim 1 , wherein a respective process identifier of the virtual host is generated from the PID namespace.
4. The method of claim 1 , further comprising maintaining a mapping between a virtual host identifier of the virtual host and the PID namespace.
5. The method of claim 1 , wherein the container process manager is further configured to:
run in the container of the virtual host; and
manage processes of the virtual host.
6. The method of claim 1 , wherein the container process manager is a parent process within the container of the virtual host, and wherein the child process is a script interpreter process capable of operating with the web server.
7. The method of claim 1 , further comprising, in response to detecting a failure of the container process manager for a second web request from the client, sending an error message to the client.
8. The method of claim 1 , further comprising sending a request from the container process manager to the web server, wherein the request comprises a process identifier from the PID namespace and a virtual host identifier of the virtual host, and wherein the request indicates a request for registering the container with the web server.
9. A non-transitory computer-readable storage medium storing instructions that when executed by a computer cause the computer to perform a method for isolating virtual hosts on a computing system, the method comprising:
creating, by the computing system, a container for a virtual host of a web server running on the computing system by creating a directory tree for the virtual host and setting a home directory of the directory tree as a root directory for the virtual host;
operating a container process manager on the virtual host in the container;
in response to receiving a web request for a dynamic web resource from a client by the container process manager on the virtual host,
spawning a child process from the container process manager and restricting the child process within the container and a process identifier (PID) namespace for the virtual host of the web server;
running the child process for generating the dynamic web resource in the container; and
sending, by the container process manager, a response message comprising the dynamic web resource to the client.
10. The non-transitory computer-readable storage medium of claim 9
wherein the directory tree includes one or more common resource utilization directories.
11. The non-transitory computer-readable storage medium of claim 9 , wherein a respective process identifier of the virtual host is generated from the PID namespace.
12. The non-transitory computer-readable storage medium of claim 9 , wherein the method further comprises maintaining a mapping between a virtual host identifier of the virtual host and the PID namespace.
13. The non-transitory computer-readable storage medium of claim 9 , wherein the container process manager is further configured to:
run in the container of the virtual host; and
manage processes of the virtual host.
14. The non-transitory computer-readable storage medium of claim 9 , wherein the container process manager is a parent process within the container of the virtual host, and wherein the child process is a script interpreter process capable of operating with the web server.
15. The non-transitory computer-readable storage medium of claim 9 , wherein the method further comprises, in response to detecting a failure of the container process manager for a second web request from the client, sending an error message to the client.
16. The non-transitory computer-readable storage medium of claim 9 , wherein the method further comprises sending a request from the container process manager to the web server, wherein the request comprises a process identifier from the PID namespace and a virtual host identifier of the virtual host, and wherein the request indicates a request for registering the container with the web server.
17. A computing system for facilitating dynamic load-based merging, the computing system comprising:
a processor; and
a memory coupled to the processor and storing instructions, which when executed by the processor cause the processor to perform a method, the method comprising:
creating, by the computing system, a container for a virtual host of a web server running on the computing system by creating a directory tree for the virtual host and setting a home directory of the directory tree as a root directory for the virtual host;
operating a container process manager on the virtual host in the container;
in response to receiving a web request for a dynamic web resource from a client by the container process manager on the virtual host,
spawning a child process from the container process manager and restricting the child process within the container and a process identifier (PID) namespace for the virtual host of the web server;
running the child process for generating the dynamic web resource in the container; and
sending, by the container process manager, a response message comprising the dynamic web resource to the client.
18. The computing system of claim 17 ,
wherein the directory tree includes one or more common resource utilization directories.
19. The computing system of claim 17 , wherein a respective process identifier of the virtual host is generated from the PID namespace.
20. The computing system of claim 17 , wherein the method further comprises, in response to detecting a failure of the container process manager for a second web request from the client, sending an error message to the client.