FreeBSD SSH

How-To-Enable-SSH-On-FreeBSD.png

允许SSH 访问

编辑 /etc/rc.conf 文件

sshd_enable = "YES"

启动 sshd

# /etc/cd.c/sshd start

登录慢

当 SSH client 连接到server后，server会向 /etc/resolv.conf 中的nameserver 请求 client 端 IP 的逆向解析，而 client 端 IP（或者是client端IP对应的域名？）在 nameserver 中不存在，所以会很慢。

编辑 /etc/ssh/sshd_config 文件

# vim /etc/ssh/sshd_config 
#UseDNS yes
UseDNS no
:wq
# /etc/rc.d/sshd restart

JDK

使用 pkg 安装

# pkg search ^openjdk
openjdk-7.251.02.1,1           Java Development Kit 7
openjdk-jre-7.251.02.1,1       Java Development Kit 7
openjdk11-11.0.6+10.1_1        Java Development Kit 11
openjdk12-12.0.2+10.3_1        Java Development Kit 12
openjdk13-13.0.2+8.1           Java Development Kit 13
openjdk14-14+36.1              Java Development Kit 14
openjdk8-8.242.07.1            Java Development Kit 8
openjdk8-jre-8.242.07.1        Java Runtime Environment 8
#  pkg install openjdk8-8.242.07.1
Updating FreeBSD repository catalogue...
FreeBSD repository is up to date.
All repositories are up to date.
The following 4 package(s) will be affected (of 0 checked):

New packages to be INSTALLED:
        java-zoneinfo: 2019.b
        javavmwrapper: 2.7.5
        libinotify: 20180201_1
        openjdk8: 8.242.07.1

Number of packages to be installed: 4

The process will require 191 MiB more space.
80 MiB to be downloaded.

Proceed with this action? [y/N]: y

# 忽略了中间的输出 ...

Message from libinotify-20180201_1:

--
Libinotify functionality on FreeBSD is missing support for

  - detecting a file being moved into or out of a directory within the
    same filesystem
  - certain modifications to a symbolic link (rather than the
    file it points to.)

in addition to the known limitations on all platforms using kqueue(2)
where various open and close notifications are unimplemented.

This means the following regression tests will fail:

Directory notifications:
   IN_MOVED_FROM
   IN_MOVED_TO

Open/close notifications:
   IN_OPEN
   IN_CLOSE_NOWRITE
   IN_CLOSE_WRITE

Symbolic Link notifications:
   IN_DONT_FOLLOW
   IN_ATTRIB
   IN_MOVE_SELF
   IN_DELETE_SELF

Kernel patches to address the missing directory and symbolic link
notifications are available from:

https://github.com/libinotify-kqueue/libinotify-kqueue/tree/master/patches

You might want to consider increasing the kern.maxfiles tunable if you plan
to use this library for applications that need to monitor activity of a lot
of files.
=====
Message from openjdk8-8.242.07.1:

--
This OpenJDK implementation requires fdescfs(5) mounted on /dev/fd and
procfs(5) mounted on /proc.

If you have not done it yet, please do the following:

        mount -t fdescfs fdesc /dev/fd
        mount -t procfs proc /proc

To make it permanent, you need the following lines in /etc/fstab:

        fdesc   /dev/fd         fdescfs         rw      0       0
        proc    /proc           procfs          rw      0       0

OpenJDK实现需要安装几个文件系统以实现完整功能。 运行以下命令立即执行所需的安装：

$ sudo mount -t fdescfs fdesc /dev/fd
$ sudo mount -t procfs proc /proc

为了使这种更改永久，我们必须添加这些挂载点， /etc/fstab的文件。 打开要立即编辑的文件：

$ sudo vi /etc/fstab

将以下安装信息插入到文件中：

fdesc   /dev/fd     fdescfs     rw  0   0
proc    /proc       procfs      rw  0   0

保存并退出。

最后，您将需要重新哈希，以确保您可以立即使用您的新Java二进制文件：

$ rehash

使用 ports 安装

$ cd /usr/ports/java && ls -d openjdk*
openjdk11       openjdk13       openjdk7-jre    openjdk8-jre
openjdk12       openjdk7        openjdk8

# cd  /usr/ports/java/openjdk8
# make install clean

您将看到一系列提示，要求您选择要构建Java端口及其依赖关系的选项和库。 您可以接受默认值或根据您的需要自定义。

在您回答所有提示后，将构建并安装OpenJDK端口及其依赖项。

这个OpenJDK实现需要安装几个文件系统以实现完整功能。 运行以下命令立即执行所需的安装：

$ sudo mount -t fdescfs fdesc /dev/fd
$ sudo mount -t procfs proc /proc

为了使这种更改永久，我们必须添加这些挂载点， /etc/fstab的文件。 打开要立即编辑的文件：

$ sudo vi /etc/fstab

将以下安装信息插入到文件中：

fdesc   /dev/fd     fdescfs     rw  0   0
proc    /proc       procfs      rw  0   0

保存并退出。

最后，您将需要重新哈希，以确保您可以立即使用您的新Java二进制文件：

$ rehash

您选择的OpenJDK端口现在已安装并准备使用！

参考：

https://www.ostechnix.com/how-to-enable-ssh-on-freebsd/
https://www.howtoing.com/how-to-install-java-on-freebsd-10-1/