步骤一：显示现在的系统版本
# cat /etc/*release*
NAME="openSUSE Leap"
VERSION="15.2"
ID="opensuse-leap"
ID_LIKE="suse opensuse"
VERSION_ID="15.2"
PRETTY_NAME="openSUSE Leap 15.2"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:opensuse:leap:15.2"
BUG_REPORT_URL="https://bugs.opensuse.org"
HOME_URL="https://www.opensuse.org/"（注意：确保显示的系统版本是 openSUSE Leap 15.2）
步骤二：准备升级
2.1 确认已使用的软件库
# zypper ls -d
# | Alias | Name | Enabled | GPG Check | Refresh | Priority | Type | URI
---+---------------------------+------------------------------------+---------+-----------+---------+----------+--------+---------------------------------------------------------------------------------------------
1 | repo-non-oss | Non-OSS Repository | Yes | (r ) Yes | Yes | 99 | rpm-md | http://download.opensuse.org/distribution/leap/15.2/repo/non-oss/
2 | repo-oss | Main Repository | Yes | (r ) Yes | Yes | 99 | rpm-md | http://download.opensuse.org/distribution/leap/15.2/repo/oss/
3 | repo-update | Main Update Repository | Yes | (r ) Yes | Yes | 99 | rpm-md | http://download.opensuse.org/update/leap/15.2/oss/
4 | repo-update-non-oss | Update Repository (Non-Oss) | Yes | (r ) Yes | Yes | 99 | rpm-md | http://download.opensuse.org/update/leap/15.2/non-oss/（补充：确保以上软件库已处于 Enabled 状态）
2.2 刷新已使用的软件库
# zypper ref（注意：确保刷新成功，否则请检查网络）
2.3 将所有 openSUSE Leap 15.2 软件包更新到最新版本
# zypper -n update2.4 用 releasever 变量替换所有版本号
# sed -i 's/15.2/${releasever}/g' /etc/zypp/repos.d/*.repo步骤三：升级系统
3.1 将版本号设置为 15.3 并刷新
# zypper --releasever=15.3 refresh3.2 提前下载并安装 openSUSE Leap 15.3 所需的软件包
# zypper --releasever=15.3 dup --download-in-advance3.3 升级系统
# zypper --releasever=15.3 dup3.4 重启系统
# reboot步骤四：后续检查
4.1 显示升级后的系统版本
# cat /etc/*release*
NAME="openSUSE Leap"
VERSION="15.3"
ID="opensuse-leap"
ID_LIKE="suse opensuse"
VERSION_ID="15.3"
PRETTY_NAME="openSUSE Leap 15.3"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:opensuse:leap:15.3"
BUG_REPORT_URL="https://bugs.opensuse.org"
HOME_URL="https://www.opensuse.org/"4.2 显示升级后已使用的软件库
# zypper ls -d
# | Alias | Name | Enabled | GPG Check | Refresh | Priority | Type | URI
---+---------------------------+------------------------------------+---------+-----------+---------+----------+--------+---------------------------------------------------------------------------------------------
1 | repo-non-oss | Non-OSS Repository | Yes | (r ) Yes | Yes | 99 | rpm-md | http://download.opensuse.org/distribution/leap/15.3/repo/non-oss/
2 | repo-oss | Main Repository | Yes | (r ) Yes | Yes | 99 | rpm-md | http://download.opensuse.org/distribution/leap/15.3/repo/oss/
3 | repo-update | Main Update Repository | Yes | (r ) Yes | Yes | 99 | rpm-md | http://download.opensuse.org/update/leap/15.3/oss/
4 | repo-update-non-oss | Update Repository (Non-Oss) | Yes | (r ) Yes | Yes | 99 | rpm-md | http://download.opensuse.org/update/leap/15.3/non-oss/
4 | repo-backports-update | Update repository of openSUSE Backports | Yes | (r ) Yes | Yes | 99 | rpm-md | http://download.opensuse.org/update/leap/15.3/backports/
5 | repo-sle-update | Update repository with updates from SUSE Linux Enterprise 15 | Yes | (r ) Yes | Yes | 99 | rpm-md | http://download.opensuse.org/update/leap/15.3/sle/（注意：升级到 openSUSE Leap 15.3 系统后，自动新增加了 repo-backports-update 软件库和 repo-sle-update 软件库）