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DD.'s questions

Martin Hope
DD.
Asked: 2014-04-23 00:32:13 +0800 CST
  • 1

我在 httpd 上使用 mod-deflate 来压缩资源。Pagespeed 抱怨外部资源（facebook 之类的按钮）没有被压缩：

Compressing https://fbstatic-a.akamaihd.net/rsrc.php/v2/yU/r/lvRlebSUWb1.js could save 126.0KiB (69% reduction).

有针对这个的解决方法吗？

apache-2.2
Martin Hope
DD.
Asked: 2013-12-10 21:44:55 +0800 CST
  • -4

我正在查看 /var/log/secure 并注意到以下内容：

Dec  9 06:03:20 ip-10-58-218-177 sshd[3794]: Did not receive identification string from 177.99.169.130
Dec  9 06:46:12 ip-10-58-218-177 sshd[3897]: reverse mapping checking getaddrinfo for grupoazul130.static.host.gvt.net.br [177.99.169.130] failed - POSSIBLE BREAK-IN ATTEMPT!
Dec  9 06:46:12 ip-10-58-218-177 sshd[3897]: Invalid user admin from 177.99.169.130
Dec  9 06:46:12 ip-10-58-218-177 sshd[3897]: input_userauth_request: invalid user admin [preauth]
Dec  9 06:46:13 ip-10-58-218-177 sshd[3897]: Received disconnect from 177.99.169.130: 11: Bye Bye [preauth]
Dec  9 06:46:14 ip-10-58-218-177 sshd[3899]: reverse mapping checking getaddrinfo for grupoazul130.static.host.gvt.net.br [177.99.169.130] failed - POSSIBLE BREAK-IN ATTEMPT!
Dec  9 06:46:15 ip-10-58-218-177 sshd[3899]: Received disconnect from 177.99.169.130: 11: Bye Bye [preauth]
Dec  9 06:46:16 ip-10-58-218-177 sshd[3901]: reverse mapping checking getaddrinfo for grupoazul130.static.host.gvt.net.br [177.99.169.130] failed - POSSIBLE BREAK-IN ATTEMPT!
Dec  9 06:46:16 ip-10-58-218-177 sshd[3901]: Invalid user user from 177.99.169.130
Dec  9 06:46:16 ip-10-58-218-177 sshd[3901]: input_userauth_request: invalid user user [preauth]
Dec  9 06:46:17 ip-10-58-218-177 sshd[3901]: Received disconnect from 177.99.169.130: 11: Bye Bye [preauth]
Dec  9 06:46:19 ip-10-58-218-177 sshd[3903]: reverse mapping checking getaddrinfo for grupoazul130.static.host.gvt.net.br [177.99.169.130] failed - POSSIBLE BREAK-IN ATTEMPT!
Dec  9 06:46:19 ip-10-58-218-177 sshd[3903]: Invalid user guest from 177.99.169.130
Dec  9 06:46:19 ip-10-58-218-177 sshd[3903]: input_userauth_request: invalid user guest [preauth]
Dec  9 06:46:19 ip-10-58-218-177 sshd[3903]: Received disconnect from 177.99.169.130: 11: Bye Bye [preauth]
Dec  9 06:46:21 ip-10-58-218-177 sshd[3905]: reverse mapping checking getaddrinfo for grupoazul130.static.host.gvt.net.br [177.99.169.130] failed - POSSIBLE BREAK-IN ATTEMPT!
Dec  9 06:46:21 ip-10-58-218-177 sshd[3905]: Received disconnect from 177.99.169.130: 11: Bye Bye [preauth]
Dec  9 06:46:23 ip-10-58-218-177 sshd[3907]: reverse mapping checking getaddrinfo for grupoazul130.static.host.gvt.net.br [177.99.169.130] failed - POSSIBLE BREAK-IN ATTEMPT!
Dec  9 06:46:23 ip-10-58-218-177 sshd[3907]: Invalid user xbian from 177.99.169.130
Dec  9 06:46:23 ip-10-58-218-177 sshd[3907]: input_userauth_request: invalid user xbian [preauth]
Dec  9 06:46:23 ip-10-58-218-177 sshd[3907]: Received disconnect from 177.99.169.130: 11: Bye Bye [preauth]
Dec  9 06:46:25 ip-10-58-218-177 sshd[3909]: reverse mapping checking getaddrinfo for grupoazul130.static.host.gvt.net.br [177.99.169.130] failed - POSSIBLE BREAK-IN ATTEMPT!
Dec  9 06:46:25 ip-10-58-218-177 sshd[3909]: Invalid user D-Link from 177.99.169.130
Dec  9 06:46:25 ip-10-58-218-177 sshd[3909]: input_userauth_request: invalid user D-Link [preauth]
Dec  9 06:46:25 ip-10-58-218-177 sshd[3909]: Received disconnect from 177.99.169.130: 11: Bye Bye [preauth]

这是什么意思，我应该担心吗？

linux
Martin Hope
DD.
Asked: 2012-06-09 00:35:20 +0800 CST
  • 0
$ df -H
Filesystem             Size   Used  Avail Use% Mounted on
/dev/mapper/vg_app001-lv_root
                        34G    12G    21G  35% /
tmpfs                  8.4G      0   8.4G   0% /dev/shm
/dev/sda1              508M    54M   429M  12% /boot
/dev/mapper/vg_app001-lv_home
                        19G   309M    17G   2% /home

我想运行一个磁盘监控脚本，但因为文件系统太长，该行被分成两行，脚本失败。

有什么建议么？

linux bash diskmanagement
Martin Hope
DD.
Asked: 2012-06-08 23:55:06 +0800 CST
  • 0
$df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_app001-lv_root
                       32G   30G     0 100% /
tmpfs                 7.8G     0  7.8G   0% /dev/shm
/dev/sda1             485M   51M  409M  12% /boot
/dev/mapper/vg_app001-lv_home
                       17G  295M   16G   2% /home

我有一个 70 GB 的硬盘驱动器，但空间已用完，但 /home 中似乎还有很多空间。我该如何重新分区？我真的必须手动管理吗？

linux partition
Martin Hope
DD.
Asked: 2012-06-07 03:35:15 +0800 CST
  • 8

我创建了一个目录

/xyz/www

具有以下权限：

-rw-r--r--. 1 myuser developers

我编辑了我的 http.conf：

DocumentRoot "/xyz/www/"
<Directory "/xyz/www/">
    Options Indexes FollowSymLinks
    AllowOverride None
    Order allow,deny
    Allow from all
</Directory>

我收到 403 错误：You don't have permission to access / on this server.

查看日志：

(13)Permission denied: Can't open directory for index: /xyz/www/

我试过递归地添加 777 权限，但仍然有同样的问题。

linux permissions httpd
Martin Hope
DD.
Asked: 2012-05-31 01:55:56 +0800 CST
  • 1

我刚刚安装了 MySQL-client-5.5.24-1.el6.x86_64.rpm。

我正在尝试连接到另一台机器上的数据库，但是当我运行“mysql”时出现错误：

$ mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

知道如何运行 mysql 客户端（没有运行服务器）

mysql
Martin Hope
DD.
Asked: 2012-05-30 23:44:32 +0800 CST
  • 4

我有一个 crontab 脚本，它可以在交互式 shell 中正常运行。但是，当从 crontab 运行时，它失败了，因为它没有运行 /etc/profile.d/ 中的脚本（例如 /etc/profile.d/java.sh）

解决此问题的最佳方法是什么？

linux cron profile
Martin Hope
DD.
Asked: 2012-05-23 23:57:30 +0800 CST
  • 1
-rw-r--r--. 1 myusername developers 169 May 17 09:01 build.sh

为什么我可以在没有执行权限的情况下从命令行执行 build.sh 脚本，但是当 crontab 尝试执行它时却失败了？

linux bash cron permissions
Martin Hope
DD.
Asked: 2012-05-17 23:15:12 +0800 CST
  • -5

我有一个由 root 创建的文件夹，我希望能够向用户组添加权限，以便他们可以移动文件等。

我做了以下事情：

chgrp -R developers testdir

文件所有者现在是 root，组所有者是 developers。为什么开发人员中的用户还不能进行更改？

linux chgrp
Martin Hope
DD.
Asked: 2012-05-17 03:38:09 +0800 CST
  • 3

我有以下 /etc/environment：

export PATH=$PATH

每当我登录时，我都会收到以下错误：

-bash: id: command not found
-bash: tty: command not found

我究竟做错了什么？

（我实际的 /etc/enviroment 更复杂，并将 java 设置到路径上，但为了简单起见，我什至无法使上述工作正常进行）

我用的是centos6

linux centos
Martin Hope
DD.
Asked: 2012-05-17 02:41:29 +0800 CST
  • 3

我正在尝试下载 git repo 的 zipball：

例如

wget https://github.com/zeromq/jzmq/zipball/master

这在网络浏览器中工作正常，但在 unix 上文件有一个奇怪的名字......我该怎么做？

github wget
Martin Hope
DD.
Asked: 2012-05-15 00:31:18 +0800 CST
  • 2

有人能解释一下为什么 IPTABLES 会阻止此规则列表中的任何端口吗：

Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere            state RELATED,ESTABLISHED
ACCEPT     icmp --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:mysql
ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:ssh
REJECT     all  --  anywhere             anywhere            reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
REJECT     all  --  anywhere             anywhere            reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

在我看来，ACCEPT ALL 行应该接受所有流量，但事实并非如此。

iptables