安装cassandra时出错

Question

我正在尝试在ubuntu 16.04 LTS上按照这里的说明安装apache cassandra - > http://docs.datastax.com/en/cassandra/3.x/cassandra/install/installDeb.html.

但是,在运行sudo apt-get install datastax-ddc命令时出现以下错误:

Reading package lists... Done Building dependency tree  
Reading state information... Done Some packages could not be
installed. This may mean that you have requested an impossible
situation or if you are using the unstable distribution that
some required packages have not yet been created or been moved
out of Incoming. The following information may help to resolve
the situation:

The following packages have unmet dependencies:
  datastax-ddc :  Depends: python-support (>= 0.90.0) but it is not
                           installable  
                  Recommends: ntp but it is not going to be installed or  
                              time-daemon
                  Recommends: datastax-ddc-tools but it is not going to
                              be installed  E: Unable to correct problems,
                              you have held broken packages.

我的python中datastax-ddc坏了还是坏了？

Answer 1

现在,您可以运行以下步骤:

1)从存储库下载deb软件包

apt-get download cassandra

2)安装deb文件,忽略依赖项

sudo dpkg --force-depends -i cassandra_3.5_all.deb

显然,您应该确保满足所有其他依赖项.在python-support已经包含在默认服务器安装,所以不用担心,不过,蟒蛇本身可能还没有被安装在系统上,所以你应该运行以下之前的dpkg -i ...:

sudo apt-get install python

要Depends: ...在尝试安装之前查看.deb,可以使用以下-I选项:

dpkg -I cassandra_3.5_all.deb

在Cassandra 3.5的情况下,我看到以下内容:

Depends: openjdk-8-jre-headless | java8-runtime, adduser, python (>= 2.7), python-support (>= 0.90.0)

因此,您可以先运行以下命令,以确保确实满足所有依赖项:

sudo apt-get install adduser python oracle-java8-installer

或者如果你想使用OpenJDK(未测试):

sudo apt-get install adduser python default-jre