Does your VPS come with any control panel ? If so, its usually safe to allow SSH access. However, here is what I would do.
Find out why the client wants SSH access. This is not a conclusive method but would give you a chance to provide alternative solutions if you are uncomfortable enabling SSH access. Note that a lot of hosting service providers, small and large, do not allow SSH access (atleast not without making it so hard that the casual client refrains from asking).
For your mental comfort, create a SSH account for yourself and login with SSH access. Try to see what you can do beyond that specific account. If your test SSH access does not allow you any access beyond that test account, you know that the other guy cant do much either.
you can allow your client to access SSH. It will not create any problem for othersites which is in the same server. As you are giving them only the user account they can not execute root commands. However if the client want to install any modules they need the root authentication.
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您的 VPS 有控制面板吗？如果是这样，那么允许 SSH 访问通常是安全的。然而，这就是我要做的。
Does your VPS come with any control panel ? If so, its usually safe to allow SSH access. However, here is what I would do.
您可以允许您的客户端访问 SSH。它不会对同一服务器中的其他站点造成任何问题。由于您仅向他们提供用户帐户，因此他们无法执行 root 命令。但是，如果客户端想要安装任何模块，他们需要根身份验证。
you can allow your client to access SSH. It will not create any problem for othersites which is in the same server. As you are giving them only the user account they can not execute root commands. However if the client want to install any modules they need the root authentication.