fail2ban 整天都在创建 SSL 证书

fail2ban 整天都在创建 SSL 证书

我今天尝试在我的 ubuntu 16.04 服务器上安装 fail2ban。它似乎安装正确。不幸的是,这个命令已经运行了 3 个多小时。

Creating/Updating SSL(for TLS) information
Creating /etc/mail/tls/starttls.m4...
Creating SSL certificates for sendmail.

这是我的第一个 AWS EC2 Ubuntu 盒子,所以所有这些技术对我来说都是非常新的。我不太确定如何处理这种情况。这是它在此之前发布到控制台的信息hanging

    Setting up sendmail-bin (8.15.2-3) ...
    Updating sendmail environment ...
    Reading configuration from /etc/mail/sendmail.conf.
    Validating configuration.
    Writing configuration to /etc/mail/sendmail.conf.
    Writing /etc/cron.d/sendmail.
    Disabling HOST statistics file(/var/lib/sendmail/host_status).
    Reading configuration from /etc/mail/sendmail.conf.
    Validating configuration.
    Writing configuration to /etc/mail/sendmail.conf.
    Writing /etc/cron.d/sendmail.
    Could not open /etc/mail/databases(No such file or directory), creating it.
    Reading configuration from /etc/mail/sendmail.conf.
    Validating configuration.
    Creating /etc/mail/databases...

    Checking filesystem, this may take some time - it will not hang!
      ...   Done.

    Checking for installed MDAs...
    sasl2-bin not installed, not configuring sendmail support.

    To enable sendmail SASL2 support at a later date, invoke "/usr/share/sendmail/update_auth"

我不太清楚这里该做什么,是停止 fail2ban 还是取消进程?就像我说的,这是我的第一个 ubuntu 盒子,所以任何帮助都会很感激。

谢谢。

答案1

乍一看,这看起来像是一个熵问题。虚拟机有时缺乏熵,请执行以下操作来检查:

cat /proc/sys/kernel/random/entropy_avail

如果非常低,您可以尝试:

apt-get install rng-tools
rngd -r /dev/urandom

然后再次检查,并尝试再次生成 ssl 证书。

如果不是这种情况,请安装 strace 并运行您尝试的命令;看看是什么挂了。

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