As an experienced CMS website operation personnel for information security, I fully understand that in practical operations, especially in a multi-user or shared server environment, ensuring the stable operation and effective management of the application is crucial.AnQiCMS as a corporate-level content management system developed in Go language, its simplicity and efficiency in deployment is one of its advantages, which naturally includes considerations for the startup and shutdown scripts.

Now, let's delve deeply into the topic of AnQiCMS.start.shDoes the script consider the issue of insufficient permissions in a multi-user environment, which may cause PID checks to fail?

AnQiCMSstart.shThe main purpose of the script is to check if the AnQiCMS process is already running, and if not, to start a new instance. It can be seen from the provided documentation.start.shThe core logic of the script relies onps -efcommands to list all processes in the system, and togrepfilter out processes related toanqicms. Specifically, it usesps -ef | grep '\<anqicms\>' | grep -v grep | wc -lto calculate the process namedanqicmsThe number of processes.

ps -efCommands hold a special status in the Linux system, allowing any user (including non-root users) to view information about all running processes on the system, which includes the Process ID (PID), owner, CPU usage, and more. Therefore,anqicmsProcess is started by which user (such as root user or a dedicatedwwwuser),ps -efAll commands can correctly list the process. This meansstart.shThe script will not fail to detect processes started by other users during the "PID check" step due to insufficient permissionsanqicmsProcess. In other words, the script can effectively identify whether there is a process in the system.anqicmsinstance running.

Therefore, if the issue focuses on whether 'PID can be checked', the answer is affirmative.start.shThe design of the script is capable of checking across usersanqicmsThe existence of the process. The script will receive a non-zero process count, thus determining that AnQiCMS is already running and avoiding a duplicate start.

However, it is necessary to distinguish between the concepts of "checking PID" and "managing PID". Althoughstart.shCan detect PID, but if it involves performing 'management' operations on processes started by other users (especially those with higher privileges, such as root), for example,stop.shscript, make sure it points to the correct directory of the AnQiCMS executable file, and that the directory containskill -9 $existsIf a command is used to terminate a process, then a regular user will indeed encounter a lack of permissions issue.The Linux system security model specifies that a regular user cannot arbitrarily terminate a process owned by another user unless they have root or sudo privileges.

The installation guide of AnQiCMS, for example, when deploying on Baota panel, it usually specifies AnQiCMS towwwUser identity run, or run as an independent container user through Docker. In this standardized deployment mode, if you try to run with a user different from the one that started the processstop.shThe operation will fail if terminated, but this is not because 'PID cannot be checked', but due to operating system level permission restrictions.start.shThe primary responsibility is to start and prevent repeated startups, it is effective in the inspection phase, and there is no problem of 'PID cannot be checked'.

In summary, AnQiCMS'sstart.shThe script considers the detection of processes in design, even in a multi-user environment, it can also be obtained by command.ps -efCommand can effectively obtain the system.anqicmsProcess PID information, thus avoiding potential issues of repeated startup.The restriction on permissions is mainly reflected in the termination operation of these processes, which belongs to the security mechanism at the operating system level, rather than the insufficient detection capability of scripts.

Common Questions (FAQ)

  • start.shCan the script detect the AnQiCMS process started by root when running under a non-root user?Yes, it can. In Linux, theps -efThe command allows any user to view all running processes in the system. Therefore,start.shscripts can also be executed by non-root users.grepFilter out processes started by the root user.anqicmsDetermine whether the process is already running.

  • Ifstart.shDetected that the AnQiCMS process is running, but this process is not started by the current user, run againstart.shWhat will happen?In this case,start.shThe script will find outanqicmsThe process already exists (i.e., the internal)$exists -eq 0The condition is false), therefore it will not attempt to start a new AnQiCMS instance.This is the expected behavior of the script, designed to avoid creating multiple duplicate application instances in the system.

  • Whystop.shWhy does the script sometimes fail to stop the AnQiCMS process started by other users?This is notstop.shThe script cannot 'check' for the PID issue, but it is due to the permission restrictions based on security principles of the Linux operating system.Regular users usually do not have the authority to terminate processes started by other users (especially higher-privileged root users).sudorun as command or with process owner privilegesstop.shscript.